The situation at Alabama is interesting. Saban never had to pay the big money for players that a lot of other schools did. Top-tier players saw how many Bama players went on the the NFL and quite a few were willing to leave aside the immediate money for the benefit of Saban's coaching. As a result, Alabama wasn't in the right position when the NIL rulings came down. (although they DO have one of the highest "payrolls right now). Tennessee, on the other hand, was quick to respond with a big-money NIL collective. Saban was disdainful of paying players, while a lot of other coaches (think Jimbo) saw it as the way to go.
When Saban left Alabama a lot of his best players decided to utilize the portal to leave and get paid a LOT more. 39 players left the program after Saban retired. Yeah, they were still loaded, but that's a wholesale change, and the effect is amplified by the coaching change.
My favorite team, the UW Huskies, lost their entire coaching staff and 20 of their 22 starters from 2023 to the portal, graduation, and the draft. They went from playing in the national championship game for 23 to just barely becoming bowl-eligible this year.
The teams that are doing best are the teams with the biggest payrolls. Ohio St., Whoregon, and Texas are all at the top of the heap. What a surprise, huh?