Multiversal Aizen from Bleach Brave Souls?

"I transcend Everything"

Meaning he transcends everything, Space Time, Yhwach, Soul King, Gremmy, Yamamoto, Ichigo, Ichibei ect.

Lol

At least it means he transcends all other BBS forms as well, right? Meaning he should be way above people like Barragan who shatter the moon with a casual wave

There are literal different universes in Bleach Brave Souls where Ichigo has Isekai stories. There is a Multiverse with their own stories. IIRC they are all connected. Ichigo remembers then and mentioned then again when he returns in different seasons.

Yay!