Board Thread:Questions and Answers/@comment-4310945-20140425001334/@comment-28861328-20140425064318

'cept for that pesky part about Aizen being immortal. And if he fears death, the Hogyoku only continues to power him up. Aizen was on a level above that of Shinigami and Hollows (his words, not mine). Yhwach couldn't even begin to touch the realm of power he had ascended to... before Ichigo curbstomped him, but Ichigo, at the time, had reached a dimension beyond even that.