Originally Posted by Vengeance
Maybe Aizen didn't know the key was in Yamamoto's bones? Like really now how could he possibly know that? Also why would Yama willingly grant Aizen passage to the soul king? Doesn't make any sense whatsoever. The only real option for Aizen was to recreate the key which is what he was trying to do in the first place. No real plot hole here.
Edit: About Urahara it was confirmed a long time ago that he at the very least saw the spirit king based on his conversation with Aizen. This implies that he did in fact at some point go to the Soul Palace. Thought everyone already knew that.
UM what does Aizen's bankai or even the glance at his shikai grant him? Perfect hypnosis..like I said..Aizen could of learned anything from Yama and also gain access to the Soul Kingdom. Again read what I said..otherwise yes it would not make since...