No "James White role" in New England?

ESPN's Mike Reiss believes the Patriots might deploy both Damien Harris and Rhamondre Stevenson as 3-down backs this season. The idea is that they'd rotate series -- like they did in the 2nd preseason game -- but stay on the field for 3rd downs. Reiss believes RB Ty Montgomery might play "when it's a two-minute offense type of situation." If Reiss is right, Harris and Stevenson would be just RB3s in fantasy lineups when both are healthy. But if either gets hurt, the other would become a strong fantasy play.