Yeah, I've thought about a Gunther Cunningham/Chiefs type scenario, but he was fired as HC and then came back as DC several years later. I don't ever see a guy taking a demotion like that in successive years with as much pride as they have.
I secretly wish he would stay here as the DC and build in the promising defense.
Won't happen, but would be great if it did.
I do believe Rivera is a good DC because then defense (what he knows) is his only focus and real responsibility. He struggles in the management aspects of being a head coach - timeouts, game management, in-game adjustments, personnel decisions, etc. When his sole focus and responsibility is scheming for the side of the ball he knows, no problem.