bleach - Why is Ulquiorra the only Espada with a second release? - Anime & Manga Stack Exchange

In Bleach Ulquiorra is the only Espada with a second release, and he admits he has not shown Aizen. So I have come to a few questions: Why would he not show Aizen how powerful he is? Why is he the

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Ulquiorra Cifer, Bleach Wiki

Was Ulquiorra the strongest Espada, being the only one to have

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In Bleach, if Aizen was so smart, how come he didn't know about