That's correct ALL of the espada except for 9 are adjuchas. He(Aizen) said he needed to contact the vastro and to paraphrase, bring them into the fold.
And what does that say about Yami? I think Chad is going to shred him to pieces if they meet again. Unless Kubo is trying to give him to somebody weaker than Chad like whitey-chan, or some of the low end vizards.