I don't want to relitigate the DA thing, but things were bad before this year when all the injuries hit. And many, including me, wanted him fired after his first year when he showed a lack of ability to handle players and the PR part of the job. That became more obvious in his second year.
The results were mediocre the first two years and it looked to me, and others, like those teams should have won more games than they did. So, I think DA is at best a guy that gets you average results when everything is perfect but struggles when anything goes wrong. Problem is that things are going to go wrong every year and DA could never overcome that in games or during an entire season. It's why his record in one score games was so bad and why his record was around .500 or below even in average years as far as bad luck goes.
He's just not a coach that can make a team better than the sum of its parts and he even seems to make them a little worse than the sum of its parts. And that ignores the fact that he was just bad at talent evaluation outside of DBs. Which is why he didn't see what we had in Hendrickson, Ellis, or Baun and why we drafted guy like Davenport, Turner, and Foskey.