Your team does have two starters that are hard to push out of the starting line-up. He is buying low on Pollard and selling high on Gibbs.
If Monty continues to get dinged up…you have a top 5 RB1; I think that Pollard will be an RB1 the next two weeks and will wear down as the season goes on. I might look to their WR and look to upgrade your WR depth with Gibbs and punch that ticket.