He has the most polished offensive skill set as a freshman on the wing (Ennis is up there, but he's obviously a guard) that SU has seen in a long time. He does everything on offense well; his handle isn't tight, and sometimes he looks out of control driving to the rim, but he always finishes. He has a good body for a 2 G in the NBA (has to add muscle), but teams will most likely want to see an improved, and he shows flashes of creating for others but not with any consistency yet.
However, his game isn't really a rare commodity in the NBA. He's a 6'6 athlete who can shoot, almost every college team has one of those guys. I think we are so used to getting burned with these early entries that we assume he will leave, but I just don't see it.
McCullough was 100% dead set on being one and done; and Ennis/Grant were locks to go in the lottery. Unless Mali always came here knowing he'd be out after 1 year, I'd be surprised if he left since he's not even a guaranteed 1st rounder.