Running back committees and split time between backs have been popular in recent years at the NFL level. It helps keep the mileage low on the premiere backs, provides some change of pace, and helps rotate the most desirable situations for an offense.
At least that’s the theory.
Some running back committees are stronger than others and so are some one-two punches at running back. Chris Ivory and T.J. Yeldon will likely split carries (where does that leave Denard Robinson?) and have a one-two punch attack for the Jacksonville Jaguars, but they aren’t so different that it will really be a change of pace.