From the Reddit, FWIW:
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Currently the two most winningest head coaches ever fired in NFL history are:
2. Marty Schottenheimer from the 2006 Chargers. Career 47-33, 0.588
1. 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.
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Not that he's going to get fired regardless, but food for thought. BTW, I'm just fine if we move on at EOY, for the record...