What Kind of Menos Were the Espada?

[big_ac]

So we know that there was only one gillian (the noveno espada) and that the rest are either adjuchas or vastorode, but the question now is, who are the vastorodes? I have a strong suspicion that Ulquiorra is, mainly becuase he carries himself like a very powerful individual, we have yet to see him exercise really any power, and the piece of his mask that remains:
In chapter 197, when Hitsugaya describes the three hollow classifications, the picture that it shows for the vastorode appears to have a complete version of Ulquiorra's broken mask, complete with horns and that layered, ridge-look down the side of the head



We have seen, or will soon see, the abilities of Zaerapollo, Noitora, and Yammy as well as the eyepatch guy (whos name I don't remember). Where does everybody think they used to rank in the Menos hierarchy, along with the rest of the Espada?