He is just super stubborn about playing football the way he thinks it should be played. He doesn't look at his roster and alter it for his personnel. We have a perfect roster to run Briles offense. Small RBs that are good in space. A good solid pass catching TE. WRs good in space too. Instead he wants to play 12 personnel, phone booth football. Struggle running it? Let's run bunch sets that bring more defenders into play. QB not mobile? Let's run slow developing, back to the field plays that give the pass rush time to get home. If you wanna know why I always give Ewers a pass this is why. Freshwater, Chip Kelly, or Ole Lincoln would have Ewers slinging it all over the lot. We look like shit for 3 quarters while Sark tries to run his shit. Then when his back is to the wall he starts calling shit that fits Ewers and we look like world beaters. Its honestly infuriating.
That said he is a good talent evaluator and knows how to build a team. Coaches have flaws. It is what it is.