The problem is you need another complete 3-down back to step in for Pollard. Yeah- Dowdle and Davis are JAG-ish, but neither Luepke nor Deuce are well suited for that role. (Between those 2, Luepke would be the better every down back because he can block and has power)
So the team needs to keep a RB2 that can step into Pollard's role. For now that's Dowdle, for better or worse. Pollard and Dowdle are locks.
The only way Luepke makes the final 53 is if the team keeps 4 RB, or if Deuce is cut to the PS. I think they've made up their minds to keep Deuce on the 53 (a late 6th has never made the team so easily) 4 RB seems to be the only way for Luepke to make the final roster. It would be tragic to lose him.