So apparently, last episode shows that the reason why squad zero captains don't go all out is because of the blood oath that restricts their Bankai, and that a single Bankai squad 0 captain can exert enough power to shake the three worlds, a feat that totally shits on Yamamoto's Bankai which Aizen was so adamant on sealing.
Now it's clear Aizen would've been totally raped had he made it to the royal palace, lmfao.
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Shutara would've arguably solo'd Aizen + Gin + Tousen + all 10 Espada by herself.