If memory serves me correctly Murray got 1800 yards behind the Dallas line, McFadden got 1400 the next year, and Zeke with 1600 this last year? That Oline is elite. Dallas's problem during the McFadden year was a hurt Romo and hurt Dez. That Oline is scary good. Without Zeke, Alfred Morris goes for 1200+ last year.
RBs are a dime a dozen. However there are exceptions to every rule. Bell and Zeke are those exceptions. Peterson was.