I'm sure Pete would love a year, maybe two being coordinator with his son where they'd be teammates and not have a weird hc/coordinator/father/son dynamic. They could still have the father/son dynamic without work making it weird as they wouldn't have much to do with each other directly.
I'm sure he wants to be HC in the nfl and that even though he could easily be HC at some college, that he'd essentially be lying to recruits knowing that it's not going to be a long haul, at least when it's a coordinator it's implied that they could leave any offseason for a promotion.
I was on board with him coming here to be head coach, so him coming to be DC for a year or two would be nuts for recruiting.