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With 13 wins until he’s the second winningest coach in Bills history, he’s literally the most successful coach the Bills have had since Marv Levy.
https://www.espn.com/nfl/story/_/id/29646526/bills-sign-coach-sean-mcdermott-multiyear-extension
https://www.espn.com/nfl/story/_/id/29646526/bills-sign-coach-sean-mcdermott-multiyear-extension