-Fic Idea Start-
Lord Aizen realizes 20,000 years have passed while he was chilling in Muken.
Criminals came and went, but none have ever stayed as long as he did (Or something)
So, eventually, after the initial 10,000 years no one ever entered or left Muken.
Aizen was all alone.
Then, after his sentence had passed, he's realized Central 46 are a buncha dum dums and cant count.
So Lord Aizen frees himself with a casual flex of his ever-growing nigh-infinite power since he's been 'Cultivating' for basically millennia.
Breaking apart his binds with sheer AURA.
He then realizes the entrance to Muken has been destroyed.
So he pulls a SUPER BUU and just creates a wormhole with his AURA.
Then he pulls up to a futuristic Soul Society a very different Soul Society.
Or something.
-Fic Idea End-