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Positional Deep Dive: Top Central Valley Defensive Tackles

Positional Deep Dive: Top Central Valley Defensive Tackles
Photo: LJ Riley Hudl
Paul Gregorian
Paul Gregorian August 22, 2025 @ 03:47 PM
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In this article:

Harlem Nellum
Harlem Nellum 6'5" | 345 lbs | OL | 2026
CA
Julian Chavez
Julian Chavez 6'1" | 270 lbs | DL | 2026
CA
LJ Riley
LJ Riley 6'3" | 275 lbs | DL | 2027
CA
<!-- wp:acf/evaluation-block {"name":"acf/evaluation-block","data":{"player_evaluations_0_player":["1197599"],"_player_evaluations_0_player":"field_62ab9d62ecf2c","player_evaluations_0_override_profile_image":"","_player_evaluations_0_override_profile_image":"override-player-profile-image","player_evaluations_0_not_in_database":"","_player_evaluations_0_not_in_database":"field_62aba48cecf2d","player_evaluations":1,"_player_evaluations":"field_62aba7547dc44"},"mode":"preview","alignText":"left","anchor":"acf-block-68a608b4cbb1a"} --> <!-- wp:paragraph {"placeholder":"Add evaluation here...","className":"text-gray-700"} --> <p class="text-gray-700">Riley is another key piece to this loaded Frontier front and has seen his recruitment start to take off after his Sophomore year last Fall. He is heavy handed, wins with leverage and immediate knock-back and shows he can split double teams and eat blocks without giving up ground. Riley can play anywhere along the defensive front but projects as a true interior 0-3 tech in college and will only continue to grow and develop as a pass rusher over the next two years. Look for Riley to collect plenty of post-season accolades and help lead Frontier to another Norcal title run in 2025. </p> <!-- /wp:paragraph --> <!-- wp:embed {"url":"https://twitter.com/LjRiley08/status/1936906264786997740","type":"rich","providerNameSlug":"twitter","responsive":true} --> <figure class="wp-block-embed is-type-rich is-provider-twitter wp-block-embed-twitter"><div class="wp-block-embed__wrapper"> https://twitter.com/LjRiley08/status/1936906264786997740 </div></figure> <!-- /wp:embed --> <!-- /wp:acf/evaluation-block --> <!-- wp:acf/evaluation-block {"name":"acf/evaluation-block","data":{"player_evaluations_0_player":["1644059"],"_player_evaluations_0_player":"field_62ab9d62ecf2c","player_evaluations_0_override_profile_image":"","_player_evaluations_0_override_profile_image":"override-player-profile-image","player_evaluations_0_not_in_database":"","_player_evaluations_0_not_in_database":"field_62aba48cecf2d","player_evaluations":1,"_player_evaluations":"field_62aba7547dc44"},"mode":"preview","alignText":"left","anchor":"acf-block-68a608b4cba1e"} --> <!-- wp:paragraph {"placeholder":"Add evaluation here...","className":"text-gray-700"} --> <p class="text-gray-700">Nellum made the transfer over the grapevine for his senior season moving from Los Alamitos to Frontier, who has bolstered their roster this off-season coming off a state title win last December. Nellum a SDSU commit, should be a great addition to the Frontier defensive line and add elite interior length and pressure to an already stout front. He is strong at the POA, plays with heavy hands and is athletic and has some good twitch for his size. Nellum is a key name to note along the valley's best up-front this season. </p> <!-- /wp:paragraph --> <!-- wp:embed {"url":"https://twitter.com/HllywoodNellum/status/1937623097789809112","type":"rich","providerNameSlug":"twitter","responsive":true} --> <figure class="wp-block-embed is-type-rich is-provider-twitter wp-block-embed-twitter"><div class="wp-block-embed__wrapper"> https://twitter.com/HllywoodNellum/status/1937623097789809112 </div></figure> <!-- /wp:embed --> <!-- /wp:acf/evaluation-block --> <!-- wp:acf/evaluation-block {"name":"acf/evaluation-block","data":{"player_evaluations_0_player":["1283354"],"_player_evaluations_0_player":"field_62ab9d62ecf2c","player_evaluations_0_override_profile_image":"","_player_evaluations_0_override_profile_image":"override-player-profile-image","player_evaluations_0_not_in_database":"","_player_evaluations_0_not_in_database":"field_62aba48cecf2d","player_evaluations":1,"_player_evaluations":"field_62aba7547dc44"},"mode":"preview","alignText":"left","anchor":"acf-block-68a608b4cbaaa"} --> <!-- wp:paragraph {"placeholder":"Add evaluation here...","className":"text-gray-700"} --> <p class="text-gray-700">Chavez is one of the better interior rushers across the central valley and is a snappy and violent rusher that can eat double teams/drive blocks and provide a interior rush consistently. He is a high IQ player that reads blocks quickly, shows quick block recognition and pursues ball carriers backside/moves very well for his size. Having a diverse toolbox both against the run and the pass, he should have a monster senior season and be a steal at the next level for any program. </p> <!-- /wp:paragraph --> <!-- wp:embed {"url":"https://twitter.com/Julianchavez209/status/1922825545831547347","type":"rich","providerNameSlug":"twitter","responsive":true} --> <figure class="wp-block-embed is-type-rich is-provider-twitter wp-block-embed-twitter"><div class="wp-block-embed__wrapper"> https://twitter.com/Julianchavez209/status/1922825545831547347 </div></figure> <!-- /wp:embed --> <!-- /wp:acf/evaluation-block --> <!-- wp:acf/evaluation-block {"name":"acf/evaluation-block","data":{"player_evaluations_0_not_in_database":["not_in_db"],"_player_evaluations_0_not_in_database":"field_62aba48cecf2d","player_evaluations_0_player_details_selected_featured_image":"","_player_evaluations_0_player_details_selected_featured_image":"field_62cca28ffa4e7","player_evaluations_0_player_details_player_name":"Joshua Caldera","_player_evaluations_0_player_details_player_name":"field_62aba4c9ecf2f","player_evaluations_0_player_details_graduating_class":"2026","_player_evaluations_0_player_details_graduating_class":"field_62aba4ddecf30","player_evaluations_0_player_details_height":"6'2u0022","_player_evaluations_0_player_details_height":"field_62aba4e8ecf31","player_evaluations_0_player_details_weight":"265","_player_evaluations_0_player_details_weight":"field_65b288425ecf6","player_evaluations_0_player_details_position":"2406","_player_evaluations_0_player_details_position":"field_62aba4f0ecf32","player_evaluations_0_player_details_school":"Lemoore","_player_evaluations_0_player_details_school":"field_62aba4fdecf33","player_evaluations_0_player_details_club_team":"","_player_evaluations_0_player_details_club_team":"field_62d20e723441a","player_evaluations_0_player_details":"","_player_evaluations_0_player_details":"field_62aba4afecf2e","player_evaluations":1,"_player_evaluations":"field_62aba7547dc44"},"mode":"preview","alignText":"left","anchor":"acf-block-68a608b4cbcee"} --> <!-- wp:paragraph {"placeholder":"Add evaluation here...","className":"text-gray-700"} --> <p class="text-gray-700">Caldera offers position versatility on either the edge or on the interior at the prep level but should kick inside in college and be a plus athlete at the defensive tackle position. He is snappy when shooting out of his stance, shows a strong initial punch and gets immediate knock-back on the interior. Although still developing as a pass rusher, he wins with a high motor, backside pursuit and proper technique/power distribution out of his stance. </p> <!-- /wp:paragraph --> <!-- wp:embed {"url":"https://twitter.com/Jordan_Ramos6/status/1956578709705572679","type":"rich","providerNameSlug":"twitter","responsive":true} --> <figure class="wp-block-embed is-type-rich is-provider-twitter wp-block-embed-twitter"><div class="wp-block-embed__wrapper"> https://twitter.com/Jordan_Ramos6/status/1956578709705572679 </div></figure> <!-- /wp:embed --> <!-- /wp:acf/evaluation-block --> <!-- wp:acf/evaluation-block {"name":"acf/evaluation-block","data":{"player_evaluations_0_not_in_database":["not_in_db"],"_player_evaluations_0_not_in_database":"field_62aba48cecf2d","player_evaluations_0_player_details_selected_featured_image":"","_player_evaluations_0_player_details_selected_featured_image":"field_62cca28ffa4e7","player_evaluations_0_player_details_player_name":"Kamren Morgan","_player_evaluations_0_player_details_player_name":"field_62aba4c9ecf2f","player_evaluations_0_player_details_graduating_class":"2026","_player_evaluations_0_player_details_graduating_class":"field_62aba4ddecf30","player_evaluations_0_player_details_height":"5'11u0022","_player_evaluations_0_player_details_height":"field_62aba4e8ecf31","player_evaluations_0_player_details_weight":"255","_player_evaluations_0_player_details_weight":"field_65b288425ecf6","player_evaluations_0_player_details_position":"2406","_player_evaluations_0_player_details_position":"field_62aba4f0ecf32","player_evaluations_0_player_details_school":"Coalinga","_player_evaluations_0_player_details_school":"field_62aba4fdecf33","player_evaluations_0_player_details_club_team":"","_player_evaluations_0_player_details_club_team":"field_62d20e723441a","player_evaluations_0_player_details":"","_player_evaluations_0_player_details":"field_62aba4afecf2e","player_evaluations":1,"_player_evaluations":"field_62aba7547dc44"},"mode":"preview","alignText":"left","anchor":"acf-block-68a608b4cbc1c"} --> <!-- wp:paragraph {"placeholder":"Add evaluation here...","className":"text-gray-700"} --> <p class="text-gray-700">Morgan is one of the more powerful interior players across northern California and has tremendous first step quickness, heavy hands and reset abilities while able to win with both speed and power at the POA. He moves extremely well for his size, plays with good leverage to get underneath blockers and can redirect quickly and is seemingly comfortable in space when making plays behind the line. Morgan has been flying under the radar for his prep career but is going to make a next level school happy at the nose position as he has good twitch and a rare combination of size/speed. </p> <!-- /wp:paragraph --> <!-- /wp:acf/evaluation-block --> <!-- wp:paragraph --> <p></p> <!-- /wp:paragraph -->
LJ Riley

LJ Riley

CA
DL
HEIGHT 6'3"
WEIGHT 275
POS DL
CLASS 2027
View Player
​
LJ
Riley DL
Class
2027
Height
6'3"
Weight
275
HS
Frontier
|
CA
Positional Deep Dive: Top Central Valley Defensive Tackles
Riley is another key piece to this loaded Frontier front and has seen his recruitment start to take...
Written by Paul Gregorian
Read more at PrepRedzone.com
Prep Redzone

LJ Riley

Instagram Twitter
State: California
School: Frontier
Subscribe below to view this player's evaluation

Highlights

San Diego State
Harlem Nellum

Harlem Nellum

CA
OL
HEIGHT 6'5"
WEIGHT 345
POS OL
CLASS 2026
View Player
​
Harlem
Nellum OL
Class
2026
Height
6'5"
Weight
345
HS
Frontier
|
CA
Positional Deep Dive: Top Central Valley Defensive Tackles
Nellum made the transfer over the grapevine for his senior season moving from Los Alamitos to Frontier, who...
Written by Paul Gregorian
San Diego State
Read more at PrepRedzone.com
Prep Redzone

Harlem Nellum

State: California
School: Frontier
Subscribe below to view this player's evaluation

Highlights

Julian Chavez

Julian Chavez

CA
DL
HEIGHT 6'1"
WEIGHT 270
POS DL
CLASS 2026
View Player
​
Julian
Chavez DL
Class
2026
Height
6'1"
Weight
270
HS
Livingston
|
CA
Positional Deep Dive: Top Central Valley Defensive Tackles
Chavez is one of the better interior rushers across the central valley and is a snappy and violent...
Written by Paul Gregorian
Read more at PrepRedzone.com
Prep Redzone

Julian Chavez

State: California
School: Livingston
Subscribe below to view this player's evaluation

Highlights

Joshua Caldera

Joshua Caldera

HEIGHT 6'2"
WEIGHT 265
POS DL
CLASS 2026

Joshua Caldera

School: Lemoore
Subscribe below to view this player's evaluation
Kamren Morgan

Kamren Morgan

HEIGHT 5'11"
WEIGHT 255
POS DL
CLASS 2026

Kamren Morgan

School: Coalinga
Subscribe below to view this player's evaluation
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