Currently the two most winningest head coaches ever fired in NFL history are:
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Marty Schottenheimer from the 2006 Chargers. Career 47-33, 0.588
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Tony Dungy from the 2001 Buccaneers. Career 54-36, 0.600
Sean McDermott is now career 68-41, 0.624, including being 6-6 at the moment.
Firing him now would set the NFL record for most winningest HC ever fired.
It’s fun to discuss, but he is back next year save for getting blown out all remaining games.