This is false. Sean took over play calling. Confused the kick and called the D. It's 100% on him. And the D has declined since Leslie's #1 ranked defenses.
Sean handed a Rookie OC in Dorsey the reigns of Josh/Diggs in their prime and scored a whole 10 points against the Bengals in the playoffs. Instead of firing him then, Sean waited another half season. So yes, midseason, but 1.5 years into it. We are now 1.5 years into a Rookie DC and people are calling for his head, too.
I think we have a good coach and good GM. Will always be thankful to this regime for breaking the drought. But they have failed to reach the Super Bowl now 4 years in a row with an MVP level QB. If they don't make the Super Bowl this year, 5 years straight, what evidence is there that Sean can elevate this team to the next level?
This is a very fair criticism. But to your point, you're trusting this owner to hold onto a head coach who cannot get an MVP level QB to the Super Bowl. Goes both ways.
If the Bills make it to the Super Bowl this year, I will happily eat all of these words. If they don't, it's time to move on.