Only a handful of people know for sure. Maybe it was a request (that we denied) for "complete" control, whatever that actually means. Or maybe @WhatTheBuck is right about how Urban felt he got to the mountaintop at tOSU and there was nothing left for him in CFB. Or maybe it was the BMDs, or the LHN time commitment, or whatever. Only UM knows and I haven't heard him comment on it.
If you believe the "reporting," CDC wasn't driving the bus on the hire anyway, it was a handful of others. So yeah any of those possibilities you wrote above are just that, possible. Or not. I see a ton of people lashing out at the AD because they are angry with a bad loss, when 1) I don't see the AD as the root cause of the issue, and 2) I can't point to anything the AD would have done differently in the past 18 months or so (prior to that, sure).
Texas' issues, in ranked order of importance since 2009:
Mack Brown burnt the house down on the way out and fucked us, and has been actively trying to fuck us ever since to preserve his notion of his "deserved legacy" by badmouthing us all over the place. This had mostly diminished a decade later but really reverberated through the program for the 5-6 years after he left.
Unprofessionalism in the AD from 2009 - 2017 leading to easily avoidable poor hires in the head football coach. This lead to Charlie Strong and Tom Herman.
Bad luck in hiring. Hindsight is 20/20 but wow Strong looks bad in the rearview mirror. Herman looks like about what you'd expect, a mid major coach over his head. Jury still out on Sark IMO.
Texas HS football/7 on 7 - the model for TXHSFB creates amazing skill players that are picked up by top programs around the nation. I don't believe the lines are at the same level of quality anymore. This continues to be an issue and will continue to be until we regularly reach outside of the state for line recruits. We'll see how this changes.
Bad recruiting - we've brought in a lot of softies especially in the O-line. Another big reason for Sark...
Bad development - players have actually regressed when they got on campus. Big reason for the Sark pick...
Lack of NFL picks - related to everything above
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32. Facilities - no where near as big as people make it out to be
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89. Austin's distractions - waaaay down the list
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534. Woke Culture - IMO this barely registers. The Eyes controversy wasn't generated or driven by the players, it was a few loud voices on campus. Unfortunately the players got dragged into it and everyone shoved a mic in their face.
More and more I'm landing in the @David Dennison camp that getting the right guy is a fortuitous combination of luck and timing. You need the right guy and the right time at the right place.