I think there is a lesson to be learned here when it comes to athletic measurements at a combine. Some players play slower than their measured speeds. Think of all the work-out wonders like Joe Alexander that test well, but when you watch them on tape they aren't able to actually apply that maximum athleticism in the course of game.
In Jimmer's case I'm far more worried about the fact that he was never asked to play defense ... ever. How is he suddenly going to gain the reps needed to create the muscle memory and awareness needed to sit down in his stance without leaning forward when he gets tired against much tougher competition? He's also 6'0" tall with a 33" vertical jump. I'd worry about his ability to get enough elevation to get his jump shot off against taller more athletic wing defenders at the next level.