Urban Meyer, 2021
As undeserving as Jackson was of his job with the Browns in 2018, somehow Meyer was even worse off with the Jacksonville Jaguars in 2021. Without exaggeration, Meyer's less than year-long tenure as an NFL head coach will go down as quite literally one of the worst of all time.
It was next level incompetence with him, whether that be simply losing games, clashing with and allegedly harming players, and even failing at tasks so simple such as flying back with the team after away games.
Who could forget instances such as comparing the NFL to playing Alabama every week, allegedly acting promiscuously in social settings, and reportedly kicking players in practice. To say Meyer was out of his element as an NFL head coach would be a very generous understatement.
Once again, there are lots of things to worry about with Brian Callahan, but he's the polar opposite of Meyer as a man and coach. In fact, Callahan has already ensured that he has avoided such a fate, which of course is a ridiculously low bar.