he's also handicapped by the fact that he can't coach offense to save his life.
He's actually evolved into a pretty good offensive coach. His offensive efficiency ratings have been amongst the top in the entire NCAA. The problem is he's not recruiting players who want to play on the other end. Ranking in the 90s in KenPom on defense is not a recipe for success for Sean. Using your example, that'd be like D'Antoni averaging 93ppg scoring. Out of his element.