We had to improve the rotation. We saw what is likely the pinnacle of this rotation as is. We have NO hammer in an era when the competition has 2-4 of them. We went with Volquez even before injuries why? I still don't know. What Greinke would have done for even just the psyche of the team would been HUGE. We were so good against the bottom feeders last year that you couldn't legitimately expect the same type of turnout vs teams like D'Backs or Pirates.
And yes I would have been willing to package any piece not named Bruce or Votto. That includes Volquez, Alonso, Heisey, Stubbs, ANYONE.