My guess is he came back thinking he could escalate his draft value as a core player, along with NIL & the 3 peat as secondary benefits. I think that B2B jaded a lot of perspectives. That decision was encouraged by the coaching staff. They mis-evaluated. Hurley blind spot. Then when he generally tanked as a core player, he came back for the NIL and another year see if he could regroup.
Educated guess.
AJX had a 4 year, 7.5mm contract with 5mm+ guaranteed. Presuming that's around where AK would have gone in 2024 as an early second rounder, you could use that as a gauge. That's a lot more money that he got in NIL, and he would have gotten his NBA career started earlier. Early second rounders usually get decent guaranteed contracts.