But your question is a legit one.
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BumRap
I have not seen proof of that.
Jared Goff - was a #1 overall who has gotten better in Detroit
Blake Bortles - well he never got better
Sean Mannion - on a practice squad near someone
Wolford - QB coach?
Perkins - RB?
Baker Mayfield - Yah this guy knows how to play. He simply needs a good system and supporting cast.
There is no proof that McVay develops QBs, rather he develops schemes that should put a particular QB in a position to succeed. i would not credit McVay for Bakers development if we kept Baker but I think they would fit well together and are very compatible.