I'm not so high on Crompton. I think he looks for contact too often when he runs rather than looking for extra yards. If you are going to have a QB who is mobile, he had better have some WHEELS, and crompton isn't that fast, he's just pretty stout, but not stout like Tebow, so he can't exactly jackhammer defenses like a FB (he has failed when we tried...). I would love an accurate QB who can scramble and get out of the pocket to make plays (in the vein of Steve Young...obviously not as talented), but I don't think Crompton has the patience and accuracy to do that.
When I watch Crompton play, its almost like he just says "screw it" and chucks it down field. That worked pretty well when we had Meachem, but I don't know if he will be all that and a bag of chips (like most seem to think).
JMHO, but I'm not sold on Crompton.