I haven't read every detail of every post, but yeah...
The head coach is in charge of everything. He may delegate responsibility for the details to his assistants, but he absolutely is the architect for every aspect of the team's play. It would be ridiculous to think otherwise.
If a team can't defend in the NFL, the head coach can't simply say "go ask the defensive coordinator, not my problem." It's not any different in any other sport.
We've been here, done that with GM Murray citing the person in charge of the PP and PK is his responsibility; and also b/c the head coach doesn't have the final say on who to hire. That is the GM's responsibility. In the chart below (source: EP), we see Eakins inherited his PP and PK coaches in 2019-20. Then in 2021-22, Murray went and got two PP coaches in Ward and Brown as well as PK coach Stothers.
I don't blame Cronin for last year's PP unit b/c Brown was a holdover from prior to Cronin. I blame Verbeek for keeping Brown. New hire Clune actually had
some accolade for improving the PP, but I don't see any connection with Cronin:
Clune, 37, joins the Ducks organization following two seasons with the Toronto Maple Leafs in various coaching roles, beginning his post-playing career as a Player Development Coach in 2022 and joining the Toronto Marlies as Assistant Coach Nov. 29, 2023. In his first season behind the bench after joining partway through the 2023-24 campaign, Clune helped the Marlies to a Calder Cup Playoffs berth. The Marlies posted a 26-21-8 record after he joined as an Assistant Coach, while improving the power play dramatically from 13.0% (10-77) when he arrived to 21.9% (43-196) the remaining 55 games.
As for Thompson, that's
a Cronin suggestion connection:
"Cronin brought in Brent Thompson as an assistant coach to run the penalty kill and work with the defensemen. "
Verbeek should have fired Thompson last year b/c that PK unit kept deteriorating as the season went on. We haven't become noticeably better on the PK.
NFL assistant coaches/coordinators fired
When you have a defensive coach, then he is hands off on the defensive side and vice versa. If the defensive side sucks with a defensive head coach, then the head coach gets fired. If the offensive side sucks with a defensive coach, then the offensive coordinator gets fired. The
Tampa Bay Buccaneers did this after the 2022 season with their offensive coordinator (and several other coaches on the offensive side) and kept their defensive minded head coach, Bowles. The OC after Leftwich was Dave Canales, who became the Panthers' new HC. The OC after Canales was Lian Coen, who became the Jaguars' new HC.
On the flip side, the Bucs fired defensive HC Lovie Smith and promoted OC Koetter to HC.
There are plenty of coordinators fired instead solely head coaching staffs this off-season alone:
source.