@immacarlin@Jdemfoo@AnimeGuru100 Technically the current hogyuko he is using is combination of 2 hogyoku (aizen + urahra), and hogyoku is not useful to everyone unlike zanpakuto
@Jdemfoo@AnimeGuru100 Strong is not the key to promote a shinagami to squad zero, e.g. Yamamoto and Kenpachi
Only the shinigami who create something which is epoch-making is selected and promoted. For example, Oetsu created zanpakuto