Maroney has not shown the tough inside running ability that Morris has shown. With both of them often hampered by injury, there is not consistent Running Game Plan for NEP to develop and build around. I agree that the team was built for Brady and his passing style, not for the power running game.
IIRC, they ran well in the late season because Def Coord's had to keep extra help back to cover the pass thus opening the inside running lanes with 3 rushers and little LB support. Passing was still the preference, but they did bring in and sign Lamont Jordan for a reason. At first I thought it was because Kevin Faulk is getting up in years (33??) and they liked Jordan's skill set.
I like Jordan. He is hurt right now (or he was before the NE bye), but I don't see any NE RB getting more than 12-15 touches a game unless the score is heavy in their favor. And that just does not seem to be happening this year (so far anyway).
If Maroney is available on the waivers, he is worth a roster spot. If they start to run more, he will get first look and a majority of the carries. Morris will also get his share, so fantasy value is marginal until another injury separates them.