Why is adrain peterson so good...?

wat separates him 4rm all the other backs is it his speed ? reggie bush is faster than him and hes a bust ... is it his strenth .. marion barber is stronger and hes dosent get dat.. is it his size ..brandon jacobs is way bigger and not *** good is it his cutz L.T. is a great cutter and has been doing bad latley ... can sombody plzzz tell me what makes him so good becouase i want to train in theys areas becuase i am also a runningback