This goes back to, whoa, forever, in football terms. Herschel Walker ran for 1,070 yards to start what has been a fairly continuous streak of success for Eagles running backs. From Walker it was Ricky Watters and then Duce Staley and then Brian Westbrook and then LeSean McCoy.
The Eagles didn't necessarily overload their running backs, but they had the guy, even if there were some variables mixed in -- Charlie Garner with Watters, Correll Buckhalter mixing in with Staley and Westbrook -- and then last year it appeared the Eagles were going to continue having the "workhorse" running back when they dealt McCoy to Buffalo and signed DeMarco Murray and Ryan Mathews in free agency.