yet he's replaced more assistant coaches than anyone else at PSU ever has- which says the exact opposite
Except he hasn't at all.
He's had (rightly) the same DC for several years. On offense, just about every coach that left went for a head job or for a lateral-but-better job.
I don't know that the assistant coach policy/philosophy would show his unwillingness to be wrong anyway. The relationship between two grown men, and their work rapport, lack thereof, etc., much different than playing the guys in the building you've promised PT, or to be next in line to have to prove they CAN'T do the job.
Certainly, if the relationships were thought of as similar, one could look at the Rahne promotion in the same light: Why was he suddenly qualified to run that offense when Jo Mo left, outside of he was thought of "next in line to try".