Speaking of secondaries... my next kid was in my opinion the best player in Oklahoma St.'s secondary, and he was only a sophomore last year.
Forget about Markelle Martin... Justin Gilbert was the best player in OSU's secondary this past season, and the best player on the defense, period.
He finished tied for the team lead with 5 interceptions and had 10 PBU's. He's got the size you look for at about 6'0", 205 pounds... elite athlete with tremendous speed and smoothness in the hips.
What makes him special is his added return ability on special teams. He averaged over 27 yards/return last year with 2 touchdowns. He's probably the fastest player in the Big-12.
Outstanding kick returner with everything he needs to develope into a legitimate top 15 pick:
He burned Oklahoma here as a freshman: