I'd agree with the preparation difference...although think about how CKD had us prepared for Georgia.
But, I think you are correct if we are talking CNS pre-2020.
But the last few years his teams were as undisciplined as most other teams in terms of mistakes/penalties.
DeBoer is a big game coach, if you look at his resume you see that. His record against the top Pac-12 teams (and Texas) was impressive.
But then you saw some mind-boggling losses in there as well. This includes a loss to an absolutely dreadful 3-9 Arizona St. team, and a loss to 6-7 Hawaii when he had a 10-3 Fresno St. team. I guess we can add the loss to 6-7 Oklahoma to the list as well.
In all those cases these were very costly losses, the Arizona St. loss kept him out of the Pac-12 championship game that year, and the Hawaii loss kept him out of the Mountain West championship game, likewise the Oklahoma loss kept Alabama out of the SECCG.
There seems to be something built in to the way DeBoer prepares that can help his team's beat an apparently superior opponent, like Georgia this year. He can do that, but perhaps because of how he allocates his resources there's also the downside of the capability of overlooking opponents that he should be able to handily beat. I said a while ago that was Saban's superpower really, he didn't lose to teams Alabama had a big advantage over, he took care of business.
The issue going forward is the SEC is full of landmines, DeBoer can't kind of take games off like you can get away with in the Pac-12 or the Mountain West, or else you're going to have a bad time. One reason I was worried about DeBoer is I watched a lot of his Washington team last year and they had a big problem with putting teams away. They showed up to big games but then played down to weaker competition, sound familiar?
In 2023 DeBoer was 8-0 in one score games. This year he was 2-3. While he might be a pretty good coach, the truth is he got lucky last year and that luck landed him the Alabama job.