I have a theory that's been bouncing around in my head for a while when it comes to schools like Texas and coaches who win:
After going through a college S&C program and aging up a few years, the difference between a can't-miss 5-star player and a run of the mill 3-star shrinks. In some (albeit rare) cases, the 3-star passes the 5-star. This is where system and coaching becomes important. The talent gap after years in a good program closes enough that winning and losing isn't perfectly predictable by talent ratio (although it's a decent mile high guide). A program like Texas, though, is just such a phenomenal outlier that it's worth a closer look. The talent

erformance ratio is off the charts bad. If players of that caliber were developed at the same rate as the average player and put in an even remotely decent offensive/defensive system, their schedule should basically be Oklahoma and that's it.
Now that I've rambled enough, my theory is that what separates great coaches like Saban and Meyer, etc. from flameouts at schools like Texas, Georgia, Florida, Miami, Tennessee, etc. is that they command enough respect from 5-star athletes that the kids come into the program and behave in the same way a 3-star would at their dream hometown school in bumfuck Kansas. My theory is that managing the egos of top-50 recruits is Saban and Meyers' greatest gift as coaches. They're bigger than even the #1 recruit in the country, and the recruits know it. This matters. They're able to get these primadonnas to play for the team instead of themselves.
There's zero explanation for Texas' record over the last decade+ other that elite athletes no buying in. The pieces have always been there.
I don't see Sark as the kind of coach who is going to command the respect of the type of recruits that will be available to him. He's going to make promises, blow them daily like they've been blown daily their whole lives, etc., and the cycle will continue. What high school All-American isn't going to believe he's better at what he does than Sark is at coaching?