Think about it:
We let Zimmer go and the Bengals have been in contention every since
We let Wade go and the Texans are an immediate top 5 Defense
We let Ryan go and he took the worse defense in the league to a top 5 defense
Maybe, just maybe, we fans don't know as much as we think we do and should let the people who do it for a living do it. That does include Jerry and STOP listening to us know-it-alls.
I think you need to rethink what you're posting a bit. Zimmer stayed during BP's tenure and wasn't let go until Wade was hired. You can't talk about Zimmer with regards to what he's currently doing and say that his time here was a smashing success. Maybe it was talent, maybe it was scheme and maybe it was a combination of both but it was time for Zimmer to go. But you also forget Zimmer went to Atlanta in 2007 and they went 4 and 12. In 2008 he went to the Bengals and they went 4 -11 -1. In 2010 the Bengals went 4 and 12. In 2011 they went 9 and 7 with Dalton as a rookie QB and they've been in contention ever since. I don't think you can lay the credit at the feet of Zimmer for any turn around in Cincy when you have a defensive HC in Marvin Lewis with a history of good defenses and you draft a franchise QB.
Wade just got fired from Houston. In any event, no one is going to claim Wade is not a good DC. Matter of fact, most fans would probably tell you he's a much better DC than HC. For your theory to be correct, Wade needed to go to another team and be a successful HC but that won't happen because Wade won't sniff another HC job again. Wade was an utter failure here. Yes, we won a playoff game during his tenure but the foundation that was established here quickly eroded and a team that should have stayed in contention quickly fell apart.
And who knows what happened here with Rob Ryan. While his D may have had some question marks, it was his first year and I don't think a whole of fans were screaming for him to get fired. That one came out of left field and is a head scratcher.
But why don't you mention Campo or Switzer? These two guys should have never been hired as HC and haven't sniffed a head coaching job after leaving Dallas. Those hires were universally panned and the fans were right. And was Chan Gaily really the right guy for the job? Was he the best we could find at that time?
No one forced Jerry's hand to fire anyone. Jerry doesn't listen to the fans. If that was the case, Garrett would be long gone. If that was the case, the Poodle woould never have stepped foot back at Valley Ranch. If that was the case, Lacewell would not be allowed back in the state of Texas and Jerry's cell phone would block all incoming calls from the man. But the fans don't need a HC that they have a comfort zone with. The fans don't need a yes man HC to communicate with. The fans don't need an "adviser" with a horrendous track record. Jerry does. If Jerry listened to us know-it-all fans, he'd bring in a quality HC and quality GM to run the team and step aside. He never listened to us fans to begin with.........