A running back who maximized value through exceptional availability β almost never missed time. Their middle-tier career was extended by consistently being on the field.
Worth 11 points of value above a freely-available replacement running back β top 78% of all 4,642 ranked at the position. 4 of 4 seasons cleared the replacement bar, by +2.8 on average.See board β
Seasons above replacement
4 seasons Γ ~2.8 surplus β VORP 11
The full season-by-season grids, joined on one timeline. Every selected stat family stays visible at onceβno tab hopping.
| Season | Age | Team | G | GS | Rushing | Receiving | Passing | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Att | Yds | TD | Y/A | TD% | 1D | 1D% | Fmb | Tgt | Rec | Yds | TD | Ctch% | Y/R | Y/Tgt | AirYd/T | 1D | Cmp | Att | Cmp% | Yds | TD | Int | TD% | Int% | Y/A | AdjY/A | TD:INT | Rate | Sk | |||||
| 1986 | β | ARI | 16 | β | 16 | 62 | 0 | 3.9 | 0.0 | β | β | β | β | 10 | 99 | 1 | β | 9.9 | β | β | β | β | β | β | β | β | β | β | β | β | β | β | β | β |
| 1989 | β | ARI | 16 | β | 38 | 145 | 0 | 3.8 | 0.0 | β | β | β | β | 23 | 245 | 0 | β | 10.7 | β | β | β | 0 | 1 | 0.0% | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 0.0 | β | 39.6 | 0 |
| 1990 | β | ARI | 16 | β | 3 | 8 | 0 | 2.7 | 0.0 | β | β | β | β | 7 | 51 | 0 | β | 7.3 | β | β | β | β | β | β | β | β | β | β | β | β | β | β | β | β |
| 1992 | β | PHI | 16 | β | 2 | 2 | 0 | 1.0 | 0.0 | β | β | β | β | 13 | 142 | 0 | β | 10.9 | β | β | β | β | β | β | β | β | β | β | β | β | β | β | β | β |
| Career | β | 64 | β | 59 | 217 | 0 | 3.7 | 0.0 | β | β | β | 0 | 53 | 537 | 1 | β | 10.1 | β | β | β | 0 | 1 | 0.0% | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 0.0 | β | 39.6 | 0 | |
A solid career by KV-H: a remarkably steady profile that scores 49 of 100, era-normalized against rush yds/g peers across 4 scored seasons, with a short career trimming the score.
Blend 53 Γ longevity 0.93 = KV-H 49Β· confidence 100%
Season-by-season quality (era-relative rush yds/g)
Reached 3% of the all-time Receptions leader β a rotational/depth all-time profile at the position.
A 0β100 scale where 100 = matched the all-time leaderat this position. Built only from visible encyclopedia data β career production vs. the all-time leader, plus efficiency (EPA) and comparable-player confidence β so it's a transparent context score, not a subjective rating. Tiers: Elite β₯ 85 Β· Strong β₯ 65 Β· Solid β₯ 45 Β· Depth < 45. Comparable-player confidence: 91%.
Amber = this player (normalized to own peak). Indigo = average RBs aging curve. Group peak age: 21. Source: StatVault KV-H era (1999+).
College stats are not imported for this profile yet.
StatVault has the verified college attribution (BYU), but no parsed college box-score table is present in this profile artifact. The section stays here so every profile has a consistent college-stats landing point without fabricating unavailable rows.
Career teammates and draft class, derived from year-by-year rosters β every name is linked.
Vai inherited the Arizona Cardinals RB room from Ron Wolfley (1985β1990), and handed it to Johnny Johnson (1990β1992).
Statistical + physical similarity across every player in the database, position-relevant (0β100%).
Joined PHI (from ARI)
Last recorded season with PHI
Drafted by STL β Round 10, Pick 254
Joined ARI (from STL)
StatVault's proprietary player intelligence, informed by full career data. How Knox works β
Era-normalized career quality β z-scored against 4-season peers. See all β
Career durability β games played vs. scheduled, across 4 seasons.
Rush Yds translated to the 2025NFL β each season's standing among its own-era peers, projected onto 2025's scoring environment. Modern-era (1999+) coverage.
| Season | Actual Rush Yds | Rush Yds/G | β 2025 Rush Yds | β 2025 /G |
|---|---|---|---|---|
| 1986 | 62 | 3.9 | 177+115 | 10.4 |
| 1989 | 145 | 9.1 | 328+183 | 19.3 |
| 1990 | 8 | 0.5 | 158+150 | 9.3 |
| 1992 | 2 | 0.1 | 188+186 | 11.1 |
Data: nflverse:draft_picks, nflverse:players, wikipedia:season-stats (CC-BY-SA, facts-only), nfl.com:official-stats (facts-only reference), espn.com:stats-api (games-played, facts-only reference) Β· multi-source verified via the StatVault Oracle Β· updated 6/18/2026
Career Value Β· VORP
11 career value over replacement β #3589 all-time of 4,642. 2.8/season above a replacement-level RB.
Pick #254 (Rd 10) Β· STL Β· 1986 Β· +28.4 vs expected KV-H
Fan Rating
Rate Vai Sikahema β All-Time
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Composite score across availability, IR frequency, and injury severity. See all β
The room is reconstructed from arrival order among durable members (β₯4 seasons with the club) at the playerβs position group β a lineage by arrival, not a week-by-week depth chart. Distinct from the league-wide positional GOAT torch.
Darryl Clack
RB
86% match
1986 Draft ClassmatesFull class β