Congrats on the cash!
Interesting hand. Would love to know the stack depths. I agree that the shove was an easy decision in that spot, with 15BB. In a single raised pot vs someone opening maybe 15-18% of hands UTG (if really loose), AQs is enough ahead to be strongly cEV+ here. Since the bubble had broke, play should have loosened up quite a bit, making AQs even stronger than normal vs the UTG’s expanded opening range
My eyes would have been on the cutoff flat. That should have been a strong range but one you are still way ahead of. Maybe he flats with a 10% range, consisting mostly of medium pairs, with some AA/KK/AK thrown in to trap. The really curious play to me was the BB just calling there, unless he had a huge stack. 99 after an UTG open, a CO flat and a BTN shove is usually not a call. If the initial raiser had a hand and 4-bets, 99 just set 15BB on fire. Same thing if the CO was trapping, hoping you or another shorter stack would shove. At best, 99 is flipping vs the shove and that assumes it even gets to see a flop HU. If he gets called/ 4-bet and sees a flop, he’s out of position with a hand that can’t take pressure unless it hits a set. Just really not a fan of that call unless there is other info to support it.
Damn but I love this game!