Therrian Alexander III, BYU CB: the 2026 season story
Therrian Alexander III is a junior defensive back for BYU (Big 12). He ranks 1086th of 1,841 defensive backs in Division I by the Player Index, which judges every defensive back on the measures that matter at the position, adjusted for the opponents he faced.
Scouting report
Why it matters. Knowing the one or two things a player does best, and where he is ordinary, says more than any single total. Therrian Alexander III's strongest measure is interceptions per game at 0.06, 395th of 921 (the average is 0.08). His weakest is tackles per game at 2.1, 823rd of 921 (the average is 3.7).
Season production
Why it matters. Totals reward staying healthy and getting the ball; per-game numbers show how much he really carries each week. His tackles per game, 2.1, ranks 823rd among 921 ranked defensive backs.
Against every defensive back
Why it matters. Splitting the measures into how much, how well and how many big plays shows what kind of defensive back he is. Among ranked defensive backs he sits, on average, in the 11th percentile for volume, 44th for efficiency and 49th for impact.
The season, game by game
Why it matters. A season average can hide a player who is great one week and absent the next; game by game shows how dependable he is. Over 9 games, Therrian Alexander III's best came in week 6 against Iowa State and his quietest in week 3 at Colorado State.
Where he does his damage
Why it matters. Where and how a player makes his plays shows how his team uses him and what a defense has to take away.
National and conference
Why it matters. A national rank shows how a player stacks up beyond his own league, where the competition can be very different. Therrian Alexander III is 646th of 921 FBS defensive backs and 80th of 103 in the Big 12. Next up nationally is Kody Jackson of Louisiana, 0.00 ahead on the index.
Career
Why it matters. Past seasons show whether this year is a breakout, a steady climb or a step back. His best season by the Player Index was 2025 at BYU, 360th of 1,153 defensive backs.
Defensive backs like him
Why it matters. Comparing a player with his closest statistical matches puts his season in context beyond the rankings. His closest match this season is Brock Cornell of Pennsylvania.
