He didn't play in the KC game (as others have mentioned) and he had 8 snaps in the Ravens game.
I would wager money that going forward Moss gets the least number of snaps of the Bills RBs.
When will fans realize that McDermott does not push rookies (especially on the offense) early in the season.
All that being said, I'm not going to hate on the idea that Beane wants more depth (especially a bruising type of runner) at RB.