McDermott is a fine HC and will do a better job with the defense than Frazier. The problem last night is the same dumb problem as last season, and to some extent the season before. Allen can't settle to take the small gains that defenses give him. Mahomes et al made that mistake against TB in the SB, because they walked in expecting to light up TB based on the regular season game. TB played cover 2 and other safer schemes and KC didn't know what to do, because their OL also wasn't good enough to protect TBs front four pressure. Allen and Dorsey have been failing at this consistently for over a season now, and Allen alone for longer. I hate to make a Brady reference here but Brady dumbed down TBs offense down the stretch the year they beat KC. It was inefficient and TO prone trying to go deep too much. He imposed his will and brought more two TE sets, lateral motion and conservative but consistent gains to burn through the last four games and three HOF QBS in the playoffs.
The Bills have a ton of talent and a ten cent offensive strategy that falls on both Dorsey and Allen to figure out. They also need a bigger better OL for a running game that isn't all about Allen breaking free from the pocket. It's too late for that now though. The Jets and other games from last year have set a blueprint to beat Buffalo's offense - sit back and prevent the big plays and Allen will hand it to you. Nobody was open in the intermediate range either and Dorsey has to get TEs and RBs open somewhere besides the flat.