If the defense is good this year, and if we "play more physical" (especially the offensive line), Heupel will get credit by the end of this season for having made those staff changes.
But before next season, the new line will be, "But can he turn good decisions and good player development and good recruiting and a good culture into a successful playoff run?"
If you looked at college football like a board game, all the recent changes--NIL, portal, the playoffs--have only made more of the game subject to chance. Luck, injuries, crazy things no one can foresee or control, have more negative impact on success when you can't build and develop players for four years into your system.
Heupel is a builder and a players' coach. He maintains staff congruity by creating a family-welcoming work environment, and looks to promote from within his staff. All of these were major plusses in the old system. How he has rolled with the new "rules" and resultant chaos is, to me, maybe the most impressive thing about Heupel--as a coach and as a man.