I don't know if Walker's going to be the best back out of this draft but before you call someone insane for saying he will be, remember, only a crazy person would have thought that Jones-Drew would have turned out to be the best back in last year's draft or someone must have been nuts to like Frank Gore over the three backs that went top five the year before.
Walker has a leg up on most backs because he's shown that he can mentally handle a very complex NFL style offense thanks to Charlie Weis.
There's a lot more to be a successful NFL running back than just being able to run with the football.