Montgomery doesn't have to be the bell cow. We just need more production per snap than we got out of Howard and that added dimension that defenses need to account for in the pass game.
Based on Nagy's play calling last year, I bet we'll see a healthy amount of carries for all of the RBs. Whether that will be spread between 3 or 4 is the question. Patterson and Gabriel will no doubt take some carries too.
We have enough skill players to spread the ball around in the run or pass game. This offense should be more efficient than last year, and that's pretty damn exciting.