As a corner he's huge, and as a safety he's basically the same size as most draft picks. Listed at 205, probably more like 210. Most of last year's draft was about 6'1 200-210... hmmm.
He also benched 225 26 times, which would put him 1st in the last combine and 5th overall in the last 4. He's freakin tough. He's not slow. He has size. Measurables are not the issue for him.
Not to mention his skill has little to do with BYU developing him. He came to BYU a player.