It was roughly 4 years ago that, right or wrong on some level, Brian was the front runner for the head coaching job. It was also clear from multiple comments that Kirk made he was setting him up for that and OC was the next step before that happened.
Unfortunately for Kirk and Brian, this plan has completely backfired to where Brian now has not only the reputation as a big fat fucking asshole, but also (more importantly) a terrible OC. He's a national laughing stock. Everyone sees him a the poster child for nepotism and with the Wadley stuff thrown in (even though it all seems to be actually made up) he is going to be unherdable in college football at anything beyond being a position coach.
The only way this resolves itself is Brian is going to have to either be fired (lol) by Garta, demoted by Garta, or Brian picks up his family and moves away from Iowa City and Grandpa Kirk and Grandma Mary back to being a nomad NFL position coach.
I guess there is one last option, and that is Brian and Kirk pull their fucking head out of their ass and put in another QB and change the offense to at least attempt to fit modern college football.