The 49ers could add another running back in the offseason, all right.
They could draft a power back who provides a different style of running than the players already on their roster. Or, as many sentimental 49ers fans have suggested, they could sign veteran Frank Gore, who turns 36 in May.
But if they add a running back, somebody is going to have to sit.
The 49ers have Jerick McKinnon and Matt Breida under contract. Raheem Mostert is likely to return as a restricted free agent. As the team’s best special-teams player and a capable No.