Vann seems like a the perfect player to switch to a running back role. The knock on the kid is that he is almost too small to even play scatback, but if you stick him in sets where he can come out of the back field(not blocking) and be another option, he could make plays. I don't seem him playing cornerback or even a nickel corner for the Niners(due to his size), but we know that he can have some value in the return game. Why not coach him to come out of the backfield and add another dimension to the offense? He could be a poor man's Dexter McCluster. There is no denying the kid has some moves and speed.
I am curious if the Niners thought of using him in this manner as well as returning kicks.
EDIT: Stand corrected. I should double check my history before posting. I got confused with when Barry Sanders started running the football and that was late into his senior year in high school, not college. Regardless, the question remains the same.... basically, if Vann does have some real return value, could that value be enhanced with a switch to a running back role?