I can't compare the the Rankin or the Valley RB's, but I have seen Abbott and Ira. I think the Russell kid (and I use the term kid very loosely) is a totally different type of runner than Morris. He run's in a straight line on a sweep and then turns the corner. One of his biggest assets is the blocking that Abbott has. Morris is more of a "juke" runner and can make you miss him completely with his side to side movement. Russell will just run you over, and make you like it. But Russell isn't the only RB that can hurt you, #3 and #6 are both capable runners, which gives Russell enough rest so that he is full force every time.