Yeah. He's a revelation.
I still think the following guys should compete for the rotation spots next year.
Wacha, Rosenthal, Martinez.
To be honest, it wouldn't be the worst thing in the world to use a modified six man rotation.
You need 12 months of pitching from spots four and five. You could stagger them in such a way that each only handles about four months of a SP load, thus keeping them rested for potential starts in the PS .
Wacha pitches April-July, then gets sent down to Memphis and shut down for about four weeks. Then you can slowly build him back up once rosters expand.
Rosenthal breaks camp as the long guy. After pitching in that role for about six weeks you transition him into the rotation, where he can hold that spot down for the remainder of the year.
Martinez starts the in St. Louis then goes down once Rosenthal takes over. You can keep his outings shorter in AAA. Once Wacha gets rest call him back up to take over.
And, should anyone need a DL spot/break, you have guys who can get called up/transition easily to fill it.