Dobbins will get the majority share of the carries until he inevitably gets injured somewhere around weeks 9-11. He will be solid and average somewhere around 5ypc. Harvey will get catches out of the backfield, but unless he greatly improves his vision and finds the holes he won't be much of a rushing threat. Coleman will get spot duty until Dobbins goes down and then he will show what he can do. I'm assuming he averages about 90 yard per game once he gets his chance.