That I don't know for certain. I know the last time I saw him, he had a windup and had trouble controlling it. His control looked great yesterday.
I'll try and find his last start and see if I can watch a bit of it to see if had the change then?
EDIT: Seems like the stance change happened, at least, 2 starts ago, but he worked much quicker last night. He looked much crisper and his shoulder stayed tight instead of flying open.