I'd love to have Usher back if he wants to come back. I think he's just beginning to scratch his potential. He's got an NBA body and physical tools...he just needs to find more consistency on the offensive end. He's shown glimpses of someone who can create his shot driving to the basket, and his shot has improved a LOT. I compare it to the development curve Moses started have the second half of last season. He's also a good glue guy that adds value to the team...and something we'll need with a roster full of 1st and 2nd year players next season.
Usher is probably the only one that I really think should come back to improve his pro prospects. In the latter half of this season, he's started looking like a 4 star and developing his game. If he continues improving at the same rate, he could play himself into a draft position.
I don't think Bubba will develop much more. If he wants to keep playing, it will be overseas.
Jose has nothing more to prove. If he can't make the NBA, it's because of physical limitations and he'll make plenty of money overseas.
Moses could probably use another year but I don't know that his stats will be all that much more impressive than they are this year.
That said, I think they should all come back