Re: Are the Vasto-Lordes the arrancar that Aizen made? *Please, no spoilers*
I believe that espada #'s 4+ were vastolordes before they became arrancar. The term espada just means that they are the top 10 arrancar. Plus Aizen said he needed to gather the rest of the vastolordes before he takes over the soul society, which could mean he already has some.