My completely uninformed opinion is that both collectives are in pivotal years with the HC and aren't committed to spending for 27. They want to see if the HC can produce or they understand they'll need buyout money and a big war chest to attract the next HC.
We know Bama doesn't have the type of money that could buy out Deboer AND turn around and offer the next guy $40M for the 28 class.
Horns have BEEN spending huge, not gotten a lot, and now the word is Sark doesn't really have a good eye for coaching talent (see coaching turnover). If he can't produce a deep run this year, they know they either move on or keep him around another year (hoping he goes to the NFL) as a lame duck. Either way, they aren't giving him $40M to blow on his way out.
"The only happy Aggie is an unhappy Aggie." Shelby Metcalf