Mike McCarty "ran out of town".... we'll see how good a move that is. Easy to blame coaching. That will show up in the Packers play in 2019 and moving forward. See the Raiders and Lions and teams with new HC's in 2018
Tom Coughlin… we know how good a move that was. See the Giants record since. Sheli lost his mentor
Andy Reid nestled softly in KC and has accomplished more there than the Iggles have since in playoff appearances. Good move by the Iggs? debateable
Would say this, when the locker room is a mess, when the HC looses control AND when the team is no longer playing well for him, it's time to move on from the HC. See Wade Phillips. That is not the case for JG. Apparently we need more disgruntled players and locker room problems
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Fact: in spite of losing starting and back up QB's in 2016, in spite of the crap show with Zeke in 2017and despite the 3-5 start in 2018 we have a record of 29-14 over those 3 years (so far), a playoff game in 2016 where we lost by a Rogers magic act and headed towards the playoffs in 2018. I would say the team is playing well for their HC. seemingly to your dissatisfaction. JMO. In sports the HC or manager is always the scapegoat when the teams they coach don't play well. Some times that is the case and some times it is not.
The examples you sited would suggest that two of the teams teams may have been better served to keep their HC's because their success has not been great since they were "run out of town". I know you will bring up the Iggles SB win but man, that's one year of success since the exit of Andy Reid. I'm thinking the Jags and Chiefs are reasonably happy with both Coughlin and Reid. Some team will get a good HC in McCarthy too. The question is, will the Packers reap the benefits of a new HC in 2019 or will another team reap the benefits of them running McCarthy "out of town"