Linehan proved that he was willing to run when the running game wasn't super effective late in the year, but all of those carries went to Murray. He's never used a committee before.
IMO, the offense could be effective with 500 rushing attempts split among 3 backs, at least in terms of grinding the clock, setting up play action, and physically punishing the opposing defense. I just don't know if Linehan is ready to go into pure Parcells mode and coordinate an offense like that.
There's still too much finesse and too much empty backfield nonsense in Linehan's offense. We telegraphed the run-pass read too much last year and it hurt us against defenses we couldn't just impose our will on.