I'm very skeptical that Jo(_)n Gruden would end up here but I agree 100% with your take. Don't and never did like him. He milked out improvement in Tampa Bay for one season just long enough to beat the team he coached the year before. They disposed of the Raiders easily because his successor Bill Callahan did nothing to change any of the systems that Gruden had put into place.
It was the easiest coaching assignment of all: beating his former team and preying on the weaknesses of his former staff and players.
Another bizarre feature to Gruden is that he doesn't use the shotgun. I wonder how that will fly in today's NFL. The young-looking old dog might have to learn some new tricks.
As I said, I don't expect Gruden to coach the Bills but saying that he won't because he signed a contract extension with ESPN in 2011 only shows your naiveté in the ways of contracts.
Oh, and of course he'd be an improvement over Gailey.
But at what cost?
If we're gonna break the bank and give someone near-total football authority, I'd rather it was someone else.