While I agree with your general premise, that you've got to give a young pitcher time to adjust, I am skeptical of the "mechanical adjustment" story with Blair. I sat behind home plate in SD for a start, and what he was, was tentative and not trusting his stuff. He went 3-1 on everybody and nibbled with an average fastball. He just didn't trust his stuff, and it wasn't the '27 Yankees he was facing. For me, at least, that's why I give him so much crap.
His change was ready for prime time, and that's a good start. It could come together, that final start was impressive, but I'm not holding my breath on Blair. Apparently Coppy isn't either, since he's now set up a system where you have to bust your way into the rotation. We're no longer having tryouts.