How you look at running backs depends largely on the scoring in your particular league. Leagues that use PPR (Points Per Reception) pay much greater attention to their running back's involvement in their team's passing game. Much of the same can be said for tight ends, perhaps even more so. A good indication of how involved your player can be is the amount of targets (or looks) he is getting from the quarterback(s). Backs like Detroit's Reggie Bush may actually score more points receiving, while others like Seattle workhorse Marshawn Lynch get the majority of their production from the ground game.