Most very successful coaches pay attention to both offense and defense. Most very successful coaches have a strong recruiting pedigree.
In SEC championship, two “defensive coaches” will lead their teams into the game. Both may be in the CFP playoff.
In the P-12 championship, one “defensive coach” will face off against a coach with an offensive background who values defense, including the coordinator you think sucks.
In the Big 10 championship, you have two “defensive coaches” headed to the championship.
In the Big 12 championship, you have two offensive coaches in a conference that laughs at defense.
In the ACC championship, you’re going to have a “defensive coach” going against an “offensive coach” with one of the best defenses in the country.
Oh, and you mentioned saban. The greatest coach in the history of the sport is a “defensive coach”.