Amari Williams is a tough one to peg for me. In summer league, I saw him dribble up the floor at full speed, in complete control, head up, really surprising for a player his size. He also made quick decisions, really good court vision leading to some surprisingly good passes for anyone, much less someone his size. Seemed to have good hands in terms of receiving the ball. He also looked lost on the court at times and he has no shooting touch at all right now. It is hard to understand how a guy who clearly has ability, surprisingly good tools in some areas, can look so bad at other aspects.
I think the good news is that many of the positives are the "can't teach" kinds of ability. You can't teach a 7-footer to dribble up the court the way he can, you can either do it or you can't (plus or minus some level of improvement from practice). Hopefully the shooting and periods of lostness can be coached up or practiced into being. We'll see but I will be disappointed if he is not on the team one way or another.