SUlly is adjusting his game to NBA , playing taller & Quicker players every game requires tweaking for sets. In college , he could work at 75% energy and still dominate most teams . Here he has to learn and know each and every man 's weakness and tendencies work on new moves while learning a complex "D". It takes a while to deveople a complete NBA game. He'll figure out how to get open looks for jumpers, and how to put the ball in down low. Just gonna take some serious work , but he's only 20 .
I think by seasons end . 10 points /8 rebounds/game would be nice contribution by a rookie 20th pick.
His defense is improving somewhat.
I think the Celtics lucked out getting Fab, KJ and Sully, and at the same time dumped JJJ and picked up Lee.
In the big picture the rookies will pay off.