Who will be the best rookie running back?

Im going to give you 3 answers. Jahvid Best and C.J. Spiller and Ryan Matthews. Matthews comes in and he will most likely be the starter. He is a big bruising back and he will carry most of the load with Sproles bring energy. Spiller will be in a 2 back system and he will blossom on the return game and slot and carry a few times a game but he will be electric with the ball in his hands. Best is coming in mostly to be the feature back, if he proves he can stay healthy he will domainte with that speed.