Aizen's transcended form against FGT Ichigo was wild. We never truly got a clear measure of his max power before he was sealed. Was he truly immortal and omnipotent in that form, or did he still have limits Ichigo just barely pushed past? What's your take?
He was definitely on a different level, practically a god. Ichigo's FGT was a temporary power-up, but Aizen was constantly evolving. He just got unlucky.
I think he was beyond limits. Ichigo's power didn't 'defeat' him; it just weakened him enough for the Hogyoku to reject him and Urahara's seal to activate. He was immortal.
He was definitely immortal and rapidly evolving. Ichigo simply had a temporary peak of power that was just enough to overwhelm Aizen's current evolution stage before he adapted.
He was getting so strong so fast. If the Hogyoku hadn't decided he didn't want anything anymore, he would have eventually surpassed Ichigo regardless. Scary stuff! 😱
His power was limitless, but his will to power was not. He just got bored and subconsciously wanted to be a Soul Reaper again, which the Hogyoku picked up on.