Tough call. I suspect that the Steelers will be playing catch up all day and only running to keep the Pats honest. While Beck is an upgrade over Grossman, I don't think the Redskins will be able to keep up with the Bills and will need to throw to stay in the game as well.
Mendenhall will not be splitting carries so I guess that would give him the edge in a crap shoot of a call.
Please look at mine - Thanks! viewtopic.php?f=19&t=506149
When making a RB decision, always play those RBs who don't share touches first, then look at def. matchup. When making WR decision, always look at whether or not the WR is the primary receiver, then look at who his QB is, then look at def. matchup.