Nope. Hogan was not this admin, that was Doug Whaley in 2016. Both Beans and McDermott were in Carolina.
The Bills 100% made the right move by trading Sammy. They weren't going to pick up his option (in fact, I think it was Doug Whaley who declined his option), realizing how much money he would command when his deal was done. The Rams decided to move on from him as well. He just wasn't worth the $14 million a year he got from KC.
I think the Bills would have liked to keep Woods, but again, not with the deal he got from the Rams.
Goodwin? Give me a break. Sal Carpaccio shut down a fan on WGR when he brought his name up. All of the fans wanted to move on from Goodwin because they thought he was always injured and could never play a season. If McDermott or Whaley or whoever else was in charge in 2017, resigns Goodwin, fans would be up in arms.
The story on Darby was that it was a scheme issue. I think the value they got for him was decent. He's a slightly above average for a starting on a very good defense and they got a 3rd round pick for him.
You are unfamiliar with the salary cap...