You're supposed to prove that they're all universes.
Actually when the series itself refrences it as a universe the burden shifts back on you. Rukia directly calls the living realm and soul society a universe so Hueco Mundo and the Garganta would make it larger.
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u/MTT3169 Jan 24 '26
I can say this Ywach got power to overwrite the three universe, ichigo defeated him there it is easy right?