The last two people who would publicly criticize McDermott are Poyer and Hyde. He might be an incompetent choke artist but the guy can coach DBs and he made these guys a lot of money. Reading between the lines though, Poyer not flatly absolving the coaching of responsibility and parroting canned lines like "it's on the players", "the coaches aren't on the field", etc. is all you really need to know.
This meltdown lays squarely on the guy who was running up and down the sidelines calling timeouts before each of the two plays before the tying field goal. The yellow streak running down his back is why the Bills didn't win that game. But the segment of fans who still have drought PTSD will never be able to see how limited he is because he was lucky enough to land a genetic freak at QB. Without Allen, this guy is coaching DBs in Carolina right now.