He should have been starting out of ST. Hopefully, he'll finally get his chance to re-join the rotation. If he does, you can expect his K/9 to fall a bit, but otherwise if he can sustain his control gains he'll be a quite valuable fantasy starter. But the team has been so brain-dead with his situation I won't be surprised if they give the rotation slot to the batboy instead of Billingsley.
I am the Master. Don't question the Master. Just do what he says and be proud.