Confidence, he must have some kind of confidence in his game when he shoots .436 from down town.
Elite athleticism, He doesnt have that but neither does Gilchrist. He has more then enough to play the position.
Finishing ability, have you seen the Clemson game from last year or Miami game. Draining the winning shot in both of those games. Those two instances can also fall under confidence.
What you might be looking for is he lacks that "killer instinct" that a super star posses. He's not begging for the ball in the final min or throwing the team on his back when things get tough. He did show glimpse of that in the tournament by stepping up his game BIG time but never a whole season.