Title is a bit bait and switch. Should probably add "what if" to avoid confusion.
I could see Gruden doing it. Not saying I would think it likely but I could see some logic in it. Gruden wants to coach again, but the offers for HC are just not coming. Not even colleges are offering him, which is surprising. He won't raise his stock being a color commentator.
Gruden would get to work with Wilson. If you know even a little about Gruden and how he's so notoriously tough on QBs, it's easy to figure out why he took to Wilson so quickly. Gruden is a perfectionist who demands his QB to have the same intense mentality. Drew Brees would be a perfect QB for Gruden. Guess who Wilson models himself after? I think Wilson and Gruden would work very well together, because Gruden would push Wilson and get the most out of him since Wilson is terrific at rising to a challenge.
Gruden probably wouldn't take an OC job anywhere else, but seeing Seattle assistant coaches getting job interviews like crazy, he knows that our team is a hot ticket for promotion. Or, if Gruden wants to hang around, he could look at Carroll, who is already 61 years old, and might see a chance to succeed Carroll down the road even if offers don't open up for him.
My gut tells me this never happens. Even if Gruden likes the idea, Carroll might be allergic to an OC with an ego. But obviously, it would be really cool if it did happen.
I really don't want to see Bevell go by the way. Our offense has been incredible the last 5+ weeks.