Going to start seeing more use out of: Gallman, Prosise, McKinnon, Aaron Jones, McGwire
Very useful if injury to someone else, but no real standalone value: Breida, McFadden, Morris, Booker
Don't bother with: Darkwa
Each group ranked as I see them - depends on what you're looking for. To replace your RB5, I'd be more likely to grab Brieda or McFadden/Morris, as they'd instantly be top 20 if injury to the guy in front of them.