Well, he has to prove he's better than MaGahee yet, but I think even last year, he proved he belongs at the top of the list...Martin has to flounder soon..he is one of the best and underated of RB of all time, but his age and the wear and tear has to catch up to him. Dillon's case is more that of pure wear and tear on his body...he'll continue to decline as well, IMO with is age catching up as well.
So then there's RB...an up and comer...he showed last season he had the ability. Some get confused about the durability issue with him though...he just hasn't HAD to be the man on any of his teams so far. This year he'll show that he is a footballer. He's been preparing to be better than last year this offseason and is reportedly stronger and more bulked up. He's in an offense that will feature his running and passing skills. He was drafted that high for a reason and while there are busts, he hasn't shown with anything he's done so far that he's not worthy of that status...