It was only one year, but Staley’s defense was the best in the league in both points and yards allowed, featuring the top pass defense by net yards per attempt and the third-best in yards per rush. Both pass defense and rush defense.
The Packers have a front four of Clark, Wyatt, Gary, and Van Ness... that's kind of deep in the front, isn't it? Plus they have Alexander, who can't be much of a step down from Ramsey, and Walker at ILB. What did that get them? The reason Barry was fired was because the Packers have all that talent and underperformed. Staley had talent on his defense, but they didn't underperform - they were literally the best in the league. They literally couldn't be any better. That's what you want in a coach.