Besides his defensive lapses, which are becoming legendary, my one concern is his struggle to take it to the hole and score. He really seems to lack confidence/ability to put the ball on the floor and create something. When he does it, he ends up putting up a low percentage shot, which is fine if he gets fouled, but a turnover if he does not.
I have no worries about his 3 point shot on the catch and shoot; the kid can shoot, it will even out eventually. but, given his inability to score other ways, it might make it more difficult to "shoot" his way out of the slump. The better players, when they struggle from the outside, regain their confidence with a couple of closer shots. Hard to do for Young, given his struggle to create on his own.