N.F.L.’s Big Running Back Deals Will Lead to Sour Grapes

No one really denies that Cook, Kamara and the others are useful players who help their teams win. But the college ranks produce dozens of burly, speedy, determined and affordable rushers in every draft class, while the rigors of plunging into the teeth of N.F.L. defenses quickly wear down all but the rarest backs. The difference in marginal value between a 26-year-old All-Pro with 1,000 professional carries on his odometer and the typical midround rookie doesn’t come close to the costs: roughly…
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