I still think Hillman has quite a bit of potential. He clearly doesn't know the offense well yet, and he doesn't have the strength to consistently grind it out between the tackles, but he certainly can catch an edge and break some big runs in space. He's also made some big 3rd down catches this year, including yesterday.
As far as Moreno goes, I think he's a better pure runner than Ball. My guess is he's active against the Chefs and will get 5-8 carries. Assuming Willis can't play Hillman = 10-12 carries, Ball 5-8 carries, Moreno 5-8 carries.