Notwithstanding the Baylor/SWC debacle, BU had become a pariah in UT's eyes. There were elements of the UT admin that did not care what BU or the Big 12 did, but cared only what UT would do. The unknown fact is UT was perilously close to bolting to the PAC 12. Primarily because of BU, the WPD and Waco itself. And, yes, because of aggy shenanigans. This is when the media stepped in, as the LHN was threatened and "future" plans as well. I'll discuss this later.
The bottom line, as always, was money. All schools are whores, even rich ones like UT. Well, a little ego as well. The arrogance accusations at UT are not far fetched.