Dre is pretty maxed out as a prospect. He can't get any better in college offensively due to the limited amount of time he can practice with also being a student, and his defense and rebounding are already elite. He will never be a good outside shooter or free throw shooter at the college level, but he can help pro teams in other ways. He won't get drafted because of his offense.
I think he is a perfect role player in the NBA as a defender/rebounder off the bench to provde a spark.
I would be surprised to see him come back, but I sincerely hope he does come back because our team next year could be scary good with him.
As for Dinwiddie, he would be at best a 2nd rounder this year and probably spend most of next year in the D league or playing garbage minutes (5-10 minutes/game) on an NBA team. Not the best scenario for him IMO.
Right now, he has good length, size (height), and shooting form for a combo guard, but he needs another year to increase his strength in the upper body (still gets pushed around too much) and learn to finish at the rim more consistently (watch Burks tapes).
He took a little step back compared to his freshmen year in 3pt shooting percentage because he played more point guard this year compared to wing last year. I expect to see an improvement next year, and if he adds another 5-10 lbs of muscle, his "and 1s" will increase as well. He could increase his scoring to the 18-20pt range easily. That will impress scouts.
He isn't the most explosive player, which hurts his stock a little, although he has shown more dunking ability this year (dunk vs. Stanford was sweet!), his game is still below the rim, but he can do many other things very well, so I think he can improve a few more things and be drafted in the top 15 next year easily. I bet scouts love his versality!
I believe XJ has the most potential on the team if he can fix his handles, post moves, and FT shooting percentage. He is already built like a NBA small forward as a true frosh, and he is plently athletic.
Scott has great potential as well, but he is limited due to his below the rim game as well. He needs 20-40 lbs of weight to help him, and I can see him being a terrific college player but limited to make the next level beyond a bench player, which is great for us because he will probably stay four years.