Brian, player development, and personnel are totally different issues.
Petras is bad, and getting worse. That’s a position coach and recruiting failure. It’s a head coach “my way” failure.
Brian is a bad OC because he doesn’t understand play design or scheme. His philosophy is just “slow,” and he thinks adding a word like “complimentary” to it makes it a valid scheme.
Back in the O’Keefe days, you knew first half frustrations were in service of setting up second half options. Brian is a kid scrolling the menus in Madden. There is no theme or cohesion.