Grant, Starks, Green and Kuhn for the most part will determine via production whom gets the most carries and when.
I happen to think Grants gets stronger (in a rhythm so to speak) as the game wears on.. IMO, he will be afforded the opportunity to take the bulk of the carries this season with Starks picking up the fringe carries and offers a change of pace. If he can't shoulder the load.. that may change rapidly.
Green, IMO, is the wild card and with his short compact running style, could steal carries as the season wears on from both of the other two. Personally with the limited time I have watched this kid, outside of the Packers carries he has gotten, he has an impressive running style.. short strider in traffic with good change of direction skills.. something both Starks and Grant lack.. both of them are power style one cut and go backs.
Green seems more dynamic.. and if he can be decisive with is lane decisions yet keep that style present I think he has a chance to be very effective for us. And through college he has shown a very capable receiver..
So.. I think Grant carries the bulk this season with Starks carrying the balance and Green getting specific game situation duty. Next season, I would not be surprised to see either Green or Starks be the main back and the other pulling Starks duty this season.
If Green develops on a natural path.. I can see us having a nice rotation for a couple of years with Starks and Green.. maybe then the Packers will explore a scat speed type back to compliment.
"The oranges are dry; the apples are mealy; and the papayas... I don't know what's going on with the papayas!"