For reb's bench, I wonder if they'd have more motive to carry a 5-man bench is they had 5 subs worth carrying? If the extras were more interesting than a Baxter or Herrera or Szczur, maybe there'd be more interest. If you have Olt up and he's hitting .180 and whiffing every time with 1 HR per month, not much value. But, if he was hitting .265 with 2 HR's per month, maybe easier to do?
Maybe Cubs should be sellers. Sell Denorfia or Fowler or Coghlan, and take another look at Lake or Olt or somebody somehow.