Mark Sheldon posted this in his blog today about Chapman after watching him throw to live batters:
"Needing to have more than a fastball to make a successful transition to the rotation, it appears Chapman has expanded his bag of tricks. Besides the fastball and changeup, he had a slider, a two-seam fastball and also showed a split-fingered fastball. If he gets that pitch honed, he could be very tough as a starter."
I think Chapman is going to have his ups and downs, but I think he is going to prove to a lot of doubters that being moved into the rotation was the right decision.