It seems there's a common thread between the coaches you've listed and their Qbs. Two of these QBs are sure fire HOfers and all time greats. The other two are bright young studs with unlimited future potential for success.
As you mentioned, you'd take "regular season" Reid. I would too. Why hasn't he gotten over the hump? He hasn't had the game changer at QB. Ever. Good coaching is good. A good coach with a game changing QB becomes great. If the Chiefs go ahead and win a SB with Reid and Mahomes leading the way, what do you suppose the narrative would be?
Was BB a noted offensive mind before TB. No, of course not. He sure as hell seems like one now, doesn't he?
I question just how good a coach Sean Payton actually is. With Brees, I'd expect more than just one SB.
My question to you was what is an elite coaching style. Your answer never mentions anything about coaching style.
Here's my point. If the Bills should win a SB(s) with McDermott and JA, will it be because SM changed or acquired a winning "style" or, more likely, because they have found the difference making QB?