Look, it's pretty simple-
Aggy looks around and fully recognizes that we haven't been our usual self for the last 7-8 years. They've looked to try and capitalize on that and they thought they were on their way during the Manziel era. They felt as though sumlin needed just a few more pieces to make a year in year out conference title contender. But then something happened. The lightening that sumlin caught in the bottle wasn't replicated. He stalled. The recruiting continued going well for them, signing 5 star QB after 5 star QB, but something happened during the Dylan Mack, Kyler Murray, #wrts, swag copter, barber shop, period. Control got away from Sumlin. Murray and his father bullied sumlin and sumlin put up with it, and didn't fight back because it was so important to NOT let Murray come over to Texas, and sumlin put up with his B.S. because if he lost Murray, he'd never hear the end if it. BUT, he sacrificed the respect of his players and some alumni by bowing to Murray.
Then, one by one all the QB commits started bailing. This was the beginning if the end.
Aggy starts looking around and thinking "holy sh!t. We have a down Texas team, a coach that is letting all our talent leave, and WE were unable to capitalize on a perfect situation. Sumlin has to go. He has to go now. Texas is still mired in mediocrity so we need to pay someone WHATEVER THEY WANT to take this job, bury the longhorns in recruiting, and do what sumlin couldn't do."
And here we are. A coach with a $75 million guaranteed contract, a national champion win, and almost zero idea how to recruit in Texas. It's a bold strategy and honestly, there's no way to predict how it turns out for them.