Iowa fan here, but you couldn't be more wrong. That more than anything infuriated us. When he wasn't kept on the shelf and had to actually face reporters he constantly showed his arrogance as his putrid offense sank all the way to the bottom in all of football. After 2022 he'd have been fired from literally ever job where his boss wasn't his dad. In the off season he actually said "We’re going to do the same things we do and we’re going to do them better,”. Nothing says ego quite like admitting no fault in your last place offense and there's no reason to change anything you do.
His one year as a positional coach in New England he inherited Aaron Hernandez and Rob Gronkowski. Gronk did just fine without Brian's tutelage for many years after he left. Guessing Hernandez would have been fine if he didn't flip his lid. Before that he was basically an intern there under his dad's buddy Bellichik, and after that he worked under his dad. He even had at one point two former OCs under him at Iowa as assistants and still couldn't assemble a functional offense.
Back to the ego thing, his coaching career was born rounding third and tripping over the bag on his way to the plate, but he feels he hit a home run. If you want him, you can have him.