Lots. USCw got one of the hottest OCs in college football when everybody thought their coach was a dead man walking.
Coaches have egos. And if you think with a talent advantage you could put up a ton of points with your system, what do you care if the coach is fired? You think the OC at Tulane cares if he’s only at Miami one year putting up 40 on everybody? If Diaz is fired he’d be unemployed for a day after that kind of season on offense.
You hire an OC that is at a stepping stone coordinator position. Those guys would gladly leave their current job.