I fail to see an NBA role for Jefferson. He's an unathletic tweener (the worst kind) who's strong enough to beat up on college kids but won't get any separation in the pros. He can't guard NBA 3's or 4's.
For some unfathomable reason, college teams guard him like he's Steph Curry, even though he's a bad (and very low volume) 3pt shooter even at that level. Every pro team would sag off him from day 1 and make him prove he can hit some shots.
I feel like this is the exact NCAA player type fans always fall irrationally in love with. Right now, he looks like a man among boys... in the League, he'll look like a slow man among quick men.