Aaron Craft would play at most a couple of minutes a game in the pros. Now after another offseason of developing a competent shot (instead of one he avoids at almost all costs), he could become a role player.
Q is the clear NBA talent and that is obvious after about 3 plays. The difference is that he has a ton of room to improve and reduce/remove his red flags (defense, consistency, turnovers). In contrast, Deshaun is never going to improve his very poor leaping ability, weak quickness, tweener size (too slow for SF too small for PF)... and is unlikely to erase his defensive weaknesses given how far he has to climb just to be projected as 'poor' on defense in the league.
He is a scorer, but won't be longer and stronger than a lot of players he faces in the league. There the league is stacked with 6'5" swingmen that play the 2 or 3 and can jump & run with the best athletes, and there are too many mildly less athletic 6'7" athletic forwards, let alone the 6'9/11" face up 4s and 5s. It's why Terrelle Pryor was a dime a dozen in bball but a superstar recruit in football.
At this point, Deshaun is who he is as a prospect. It's unlikely to change with another year. He can possibly shift his very poor defense to passable, but he'll still be very limited physically and will probably go right back to the bottom of the pile defensively just by switching to a much more athletic pro caliber of player.
He needs to do what is best for him. You can't ask for much more from a guy who was an all-world player from the time he hit puberty. Three years is more than anyone could have expected.
Thanks for a great career Deshaun. If Matta sneaks you back for another year, it will be gravy.