Unless one of them handles all the returning, dressing two import tailbacks is a waste of a roster spot IMO.
I disagree.
Look at Cortez system, he has 2 import tailbacks every game but they have Tristan Jackson returning kicks.
It's only a waste of spot if you don't utilize the other back. Even now, Volny is a waste of spot.
If Marcel can give each RB a number of snaps during the game by alternating them or on 2-backs packages, it's not a waste of spot, imo.