Sebastian Joseph-Day is a career quality starter — a pass rusher whose body of work places Joseph-Day in the top half of all players at the position historically. The Knox model values sustained contribution over flash, and Joseph-Day's career arc reflects exactly that kind of reliable professional-grade performance.

DTPIT#69ACT

Sebastian Joseph-Day

Top 36% all-time pass rushersReliable Starter📈 Late Developer · 2023

Height6'4"

Weight310 lb

BornMar 21, 1995

Age31

CollegeRutgers See College Stats

ConferenceBig Ten

Rookie yr2018

Draft2018 · Rd 6, Pick 195 · LA

Archetype Intelligence

Reliable StarterExplore archetypes →

A edge rusher with a above-average career — the kind of consistent contributor every roster needs. Solid availability (excellent availability over their career) added to their value.

Career Value · VORP

VORP 58 · #1876 · Above Average

Worth 58 points of value above a freely-available replacement interior lineman — top 41% of all 4,642 ranked at the position. 7 of 7 seasons cleared the replacement bar, by +8.3 on average.See board →

Seasons above replacement

7 cleared

Beat replacement (adds to VORP) Below it — adds 0, never a debit

Replacement

the KC-H bar

→

Seasons over

cleared the bar

+8.3

Avg surplus

peak +12

7 seasons × ~8.3 surplus ≈ VORP 58

Combined Season Grid

The full season-by-season grids, joined on one timeline. Every selected stat family stays visible at once—no tab hopping.

3 grids split in one view

Season	Age	Team	G	GS	Defense													Snap Counts						Advanced Defense & Coverage (2018+)
Season	Age	Team	G	GS	Tkl	Solo	Ast	TFL	QBHits	Sk	Dis	Int	PD	FF	FR	TD	Sfty	Off	Off%	Def	Def%	ST	ST%	Tgt	Cmp	Cmp%	RateAll	ADOT	Prss	Hrry	QBKD	Bltz	MissTkl	Miss%
2019	—	LA	15	—	37	18	19	5	5	2.0	12.0	0	1	0	—	0	0	—	0.0%	481	43.1%	84	17.4%	1	1	1.0	83.3	-6.0	8	5	1	3	3	0.1
2020	—	LA	14	—	52	32	20	1	4	1.0	6.0	0	3	1	—	0	0	—	0.0%	412	40.6%	56	12.6%	1	1	1.0	79.2	-3.0	5	1	3	0	4	0.1
2021	—	LA	7	—	31	16	15	3	5	3.0	11.0	0	0	0	—	0	0	—	0.0%	341	69.1%	—	0.0%	0	0	—	—	—	7	2	2	0	1	0.0
2022	—	LAC	15	—	51	22	29	9	6	2.0	17.0	1	1	1	1	0	1	—	0.0%	702	70.1%	68	17.6%	3	2	0.7	30.6	-3.0	8	2	4	0	2	0.0
2023	—	SF	15	—	34	16	18	3	11	3.0	17.0	0	0	0	—	0	0	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—
2023	—	LAC	16	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	0.0%	604	55.1%	33	14.5%	—	—	—	—	—	—	—	—	—	—	—
2023	—	2TM	16	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	0	0	—	—	—	11	1	7	2	2	0.1
2024	—	TEN	17	—	42	16	26	3	6	2.5	11.5	0	1	0	—	0	0	—	0.0%	486	46.1%	86	18.5%	0	0	—	—	—	7	2	2	0	6	0.1
2025	—	TEN	15	—	37	18	19	6	6	2.0	14.0	0	0	0	1	0	0	—	0.0%	449	45.0%	83	18.9%	0	0	—	—	—	8	2	4	0	2	0.0
Career		—	130	—	284	138	146	30	43	15.5	88.5	1	6	2	2	0	1	—	0.0%	3,475	52.7%	410	16.6%	5	4	—	—	—	54	15	23	5	20	—

Defense

Season	Age	Team	G	GS	Tkl	Solo	Ast	TFL	QBHits	Sk	Dis	Int	PD	FF	FR	Sfty	VAL
2019	24	LA	15	0*	37	18	19	5	5	2.0	12.0	0	1	0	—	0	7.8
2020	25	LA	14	0*	52	32	20	1	4	1.0	6.0	0	3	1	—	0	6.9
2021	26	LA	7	5*	31	16	15	3	5	3.0	11.0	0	0	0	—	0	5.6
2022	27	LAC	15	11*	51	22	29	9	6	2.0	17.0	1	1	1	1	1	10
2023	28	SF	15	9*	34	16	18	3	11	3.0	17.0	0	0	0	—	0	8.5
2024	29	TEN	17	0*	42	16	26	3	6	2.5	11.5	0	1	0	—	0	8.1
2025	30	TEN	15	0*	37	18	19	6	6	2.0	14.0	0	0	0	1	0	8.1
Career			98	25*	284	138	146	30	43	—	—	1	6	2	2	1	55

* GS not available from free sources — SG* estimated from snap share (nflverse 2012+)

Snap Counts

Season	Age	Team	G	GS	Off	Off%	Def	Def%	ST	ST%
2019	24	LA	16	0*	—	0.0%	481	43.1%	84	17.4%
2020	25	LA	16	0*	—	0.0%	412	40.6%	56	12.6%
2021	26	LA	7	5*	—	0.0%	341	69.1%	—	0.0%
2022	27	LAC	16	11*	—	0.0%	702	70.1%	68	17.6%
2023	28	LAC	16	9*	—	0.0%	604	55.1%	33	14.5%
2024	29	TEN	17	0*	—	0.0%	486	46.1%	86	18.5%
2025	30	TEN	16	0*	—	0.0%	449	45.0%	83	18.9%
Career			104	25*	—	—	3,475	—	410	—

* GS not available from free sources — SG* estimated from snap share (nflverse 2012+)

Advanced Defense & Coverage (2018+)

Season	Age	Team	G	GS	Tgt	Cmp	Cmp%	RateAll	ADOT	Prss	Hrry	QBKD	Bltz	MissTkl	Miss%
2019	24	LA	16	0*	1	1	1.0	83.3	-6.0	8	5	1	3	3	0.1
2020	25	LA	16	0*	1	1	1.0	79.2	-3.0	5	1	3	0	4	0.1
2021	26	LA	7	5*	0	0	—	—	—	7	2	2	0	1	0.0
2022	27	LAC	16	11*	3	2	0.7	30.6	-3.0	8	2	4	0	2	0.0
2023	28	2TM	16	9*	0	0	—	—	—	11	1	7	2	2	0.1
2024	29	TEN	17	0*	0	0	—	—	—	7	2	2	0	6	0.1
2025	30	TEN	17	0*	0	0	—	—	—	8	2	4	0	2	0.0
Career			105	25*	5	4	—	—	—	54	15	23	5	20	—

* GS not available from free sources — SG* estimated from snap share (nflverse 2012+)

KV-H Anatomy

KV-H 56 · Strong Starter

A strong starter career by KV-H: a well-rounded profile that scores 56 of 100, era-normalized against sacks/g peers across 7 scored seasons.

Sustained

career value

×.6

Peak

best 3 seasons

×.4

×1

Longevity

career length

Blend 56.2 × longevity 1 = KV-H 56· confidence 98%

What builds the career mark of 55

On-field 37.7

Availability 17.3

On-field production Staying available

Season-by-season quality (era-relative sacks/g)

2019bestavg 552025

All-Time Standing

how this career measures against the all-time greats at the position

Depth

of 100

Reached 8% of the all-time Sacks leader — a rotational/depth all-time profile at the position.

8% of the all-time Sacks leader8

0 categories ≥25% of the all-time leader0

A 0–100 scale where 100 = matched the all-time leaderat this position. Built only from visible encyclopedia data — career production vs. the all-time leader, plus efficiency (EPA) and comparable-player confidence — so it's a transparent context score, not a subjective rating. Tiers: Elite ≥ 85 · Strong ≥ 65 · Solid ≥ 45 · Depth < 45. Comparable-player confidence: 92%.

Per-Snap Impact

Interior D-Line · proprietary · 2012+

Solid

SIS

Disruption / 100 snaps:2.806See leaderboard →

Disruption/1002.806Snap share52.7%Def snaps3,475ConsistentCV 0.09

Production per snap — the box score normalized by opportunity. SIS is z-scored within interior d-line, shrinkage-regularized so small samples don't spike, over the NFL snap-count era (2012+).

Career Aging Trajectory

vs. position group average · KV-H basis

Amber = this player (normalized to own peak). Indigo = average defensive linemen aging curve. Group peak age: 25. Source: StatVault KV-H era (1999+).

Postseason Career

5 playoff games

Defense

Tkl14Solo5Ast9QBHits1Sk0.5Dis1.5PD1

College Stats

RutgersImported college table

College Defense

Season	School	Tkl	Solo	Ast	TFL	QBHits	Sk	Dis	Int	PD	FF	FR	TD	Sfty
2013	Rutgers	—	1	—	—	—	—	—	—	—	0	0	—	—
2014	Rutgers	—	0	—	—	—	—	—	—	—	0	0	—	—
2015	Rutgers	—	15	—	—	—	—	—	—	—	0	1	—	—
2016	Rutgers	—	13	—	—	—	—	—	—	—	1	0	—	—
2017	Rutgers	—	18	—	—	—	—	—	—	—	1	0	—	—
Career		0	47	—	—	—	0.0	0.0	0	0	2	1	—	—

Reference Graph

Career teammates and draft class, derived from year-by-year rosters — every name is linked.

2018 Draft Class· this player went #195

#186Jacob MartinDE #187Ray-Ray McCloudWR #188Simeon ThomasDB #189Kam MooreCB #190DeShon ElliottSAF #192Jamil DembyG #193Chris CovingtonLB #194Russell GageWR #196Tremon SmithCB #197Shaun Dion HamiltonLB #198Kahlil McKenzieG #199Luke FalkQB #200Foye OluokunLB #201Boston ScottRB #202Jack CichyLB #204Trenton CannonRB

Franchise Succession

the room, before and after

Sebastian inherited the Los Angeles Chargers DL room from Jerry Tillery (2019–2021), and handed it to Morgan Fox (2022–2024).

Leslie O'Neal 1986–1995Joe Phillips 1987–1991Chris Mims 1992–1999Raylee Johnson 1993–2003John Parrella 1994–2001Marco Coleman

Similar Players

Statistical + physical similarity across every player in the database, position-relevant (0–100%).

Movementderived from season history

2025final season
Last recorded season with TEN
2024team change
Joined TEN (from SF)
2023team change
Joined SF (from LAC)
2022team change
Joined LAC (from LA)
2018draft
Drafted by LA — Round 6, Pick 195

Athletic & Unique Profile

verified measurements and curated source-tagged facts

6'4" / 310 lb

Frame

Injury History

2 career games missed (Out)

From nflverse weekly injury reports · coverage begins 2009.

Season	Team	Games Out	Designations
2023	LAC	0	W9Questionable· Illness
2022	LAC	0	W7Questionable· AnkleW14Doubtful· KneeW15Questionable· Knee / Back
2021	LA	2	W8Out· ChestW9Out· Chest
2020	LA	0	W13Questionable· Hip

Knox

StatVault's proprietary player intelligence, informed by full career data. How Knox works →

Historical Knox · KV-H

Era-normalized career quality — z-scored against 7-season peers. See all →

peak 58

Season Report Cards· KV-H era-normalized per season

C+2019

C+2020

C+2021

C+2022

C+2023

C+2024

C+2025

Availability

Career durability — games played vs. scheduled, across 7 seasons.

90%

Era Translator

Sacks translated to the 2025NFL — each season's standing among its own-era peers, projected onto 2025's scoring environment. Modern-era (1999+) coverage.

Season	Actual Sacks	Sacks/G	→ 2025 Sacks	→ 2025 /G
2019	2	0.1	2	0.1
2020	1	0.1	1	0.1
2021	3	0.4	7+4	0.4
2022	2	0.1	2	0.1
2023	3	0.2	4+1	0.2
2024	2.5	0.1	3+0.5	0.2
2025	2	0.1	2	0.1

Data: nflverse:players, nflverse:player_stats_def, nflverse:snap_counts, nflverse:draft_picks, nflverse:injuries, wikipedia:college-stats (CC-BY-SA, facts-only), espn.com:stats-api (facts-only reference) · multi-source verified via the StatVault Oracle · updated 6/18/2026

Career Value · VORP

58 career value over replacement — #1876 all-time of 4,642. 8.3/season above a replacement-level DL.

Draft OutcomeSteal ↑

Pick #195 (Rd 6) · LA · 2018 · +30.1 vs expected KV-H

56actual

25.9 expected · Δ+30.1

Fan Rating

Rate Sebastian Joseph-Day — All-Time

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Sebastian Joseph-Day

Archetype Intelligence

Career Value · VORP

Combined Season Grid

Defense

Snap Counts

Advanced Defense & Coverage (2018+)

KV-H Anatomy

All-Time Standing

Per-Snap Impact

Career Aging Trajectory

Postseason Career

Defense

College Stats

College Defense

Reference Graph

Top Teammates

2018 Draft Class· this player went #195

Franchise Succession

Similar Players

Movementderived from season history

Athletic & Unique Profile

Injury History

Knox

Era Translator

Career Geography