2015, in my opinion, is simply proof that we shouldn't write him off as a starter... just yet. 2016 had injury issues, not to mention he lost his ability to locate his FB. That would have been a problem for him in the pen too. So far this year, his FB issues seem to be resolved. As I've said before, I'm not against it if his final destination is the pen, but I think it would be very unwise to close the book on him starting at this point. It's not like we have a rotation of Cy Young candidates forcing him to the pen.