I'm wondering if Mock is trade bait. Olsen is an established pitcher.
He just shut down the damn beloved redsox. 
Fixed

I see this as Mock on a clock. He gets one, maybe two starts. IF he messes up, and if Olsen looks good, or Bally, or whoever, Mock gets sent down.
one other thing to think about: the 5th starter is only going to pitch twice over the next two weeks. Mock might do some mop up duty in a blow out and then gets sent down when we actually need the 5th starter. It'd be smart use of the options and roster structure.