We have Alvin Kamara and Taysom Hill as the top RBs. There’s no unless there. Taysom will have a featured role at RB in Kubiak’s offense. The blocking scheme is also favorable for Jamaal Williams judging by his performance in the 49ers preseason game. Mims will mainly have a passing down role.
I think it’s very likely that no backup RB on the Saints roster nor backup FA addition will outrush Taysom in yards and YPC. Taysom appears to be the 2nd RB.