Flip side is, let's say he doesn't even get an NBA sniff, and he plays overseas. Conservatively, let's say he pulls in $175,000/yr. Coming back for his senior year may simply just cost him a year of basketball earning potential.
Maybe he comes back, improves and grades out as a 1st rounder. Personally, I don't see that happening, as he tends to disappear from games for large chunks at a time.
JMHO, but the biggest problem we had last season was defense, especially at the top of the zone, with Girard and Jackson. I don't see that issue improving significantly next season.