You know I'm probably in the minority here, and I know coaches who have been out of the game forever usually bomb unless you're **** Vermeil, but I actually think Gruden 2.0 in OAK might work. Gruden's hopeless developing talent at QB--just ask Chris Simm's spleen--but he did well with established veterans like Gannon and (ugh) Brad Johnson. He might be able to get Carr to play at the top of that second-tier level. Lot of talent on that roster, and he knows how the wacky politics of the Raiders front office works. If he puts a good staff together and can check his ego a bit, honestly, there's so much bad coaching out there right now I don't see why he wouldn't jump past a lot of people pretty quickly.
Obviously the contract is comical, but that's another story.