Board Thread:Questions and Answers/@comment-10922879-20130617143901/@comment-10797017-20130622092456

I beleive it was Ulquiorra. Aizen didnt know about his second release, so it is possible to for Ulquiorra to be the strongest Espada but was modest in bringing it out. It does seem to be part of his character personality to listen to orders Aizen has given him. If he was made fourth but he knows he has the power of the first or second espada, he would just fall in line. If you think about it Grimmjow always wanted to fight Ulquiorra and maybe he too knew he was stronger than the rest secretly. For now its anyones guess. Some are going with Starrk and Yammy, but I feel maybe Kubo might reveal it to us because a particular Hollow (I wont say who I think it is but its kinda obvious) has made a voice appearance in the Thousand year arc. We might get our answers, if it is who I think it is.