I don't think Gilstrap is ready but if he needs ther money I'd bolt. He has a lot of work to do but he has NBA talent I think.
Gilstrap is the one case of player who I think benefits coming back at his age. He's old enough where he doesn't get any benefit in draft position from "potential" if he comes out this year. He has enough things to work on that he'd almost automatically go to the D league and the $30k he'd make in the D league doesn't make much of a dent in any money needs.