I disagree on ultimate responsibility. If multiple players are that far out of position on a easy to stop 3rd and forever play, that would seem to point as much to the defensive coaching as execution. This isn't the first time we've disagreed on the Bills 3rd and long failures. We just see it differently. You have been a pretty ardent Frazier defender over time it seems.
And yes, I realize this does not absolve the failures of subsequent defensive coaches, or ultimately McDermott. Frazier did produce some good results here.