The margins are razor thin at the very top. IMO it comes down to killer instinct. I have never experienced in my Texas time of being a student, alum and fan, a HC at Texas with the IT factor. Day I believe has it, Kirby, Saban, Urban, Stoops all had it.
I work in a highly entrepreneurial field with family owned and operated businesses. You can have a great line in a prime real estate location, but if the leader (in my case the owner and GM) is lacking equal parts supreme organizational skills, accountability measures, charisma, experience, competency and known verifiable results (ie skins on the wall), a competitor possessing those attributes of success, with equal product and less desirable addressable market will eat their lunch. I see it every day. Speed of the captain, speed of the ship is a tired old saying, but it means something. It means something in business, in sports management, in how one runs his household etc..
In this analogy, Texas has the product, the market and resources, but the Leadership ( Ie head coach....we have the AD) is lacking. Does your leader have 25 years experience ? Or one year experience , 25 times? I think the answer to your point is we have had the latter and have had the ladder for a long time.
We make coaches so rich here and provide all the resources that they lose the granular day to day attention to detail that manifests, in for example not accounting for the pre-snap sugar huddle motion, or the "don't jump offsides" key word that should like "fire, fire , fire"....or "this is a spot where UGA likes to use a fake (last years SEC CG) or yesterday's on side.
These are example of the most minute details that i have to believe is cultural and rote to the coaches mentioned above. The words i keep coming back to are preparation and attention to detail. I was told a story by a client who is BMD at Bama about Saban and his John Wooden shoelaces. He told the operations guy he wanted him to bring the recruit in to his office and he would be tying his (Saban) shoe when he (operations guy) and the recruit walked in. He reminded the operations guy not to say anything the next time he brought a recruit in, as he would be tying the same shoe. Point is Saban wanted to demonstrate to the kid how tying his shoes mattered, and that was how he started the conversation. Its a story as old as time, that Wooden would start every season teaching his players how to tie their shoes and put their socks on. The culture started right there in that moment.
I dont think Texas has had a coach like that. Its anecdotal, but we wont win consistently big until we have a head coach who doesn't practice to get things right, they practice until they cant get it wrong. Kirby is there and its showing. UGA's level of execution last night was all coaching, leadership and preparation.