Everyone in the Espada were at least Adjuchas, except for #9 as NB pointed out.
Seeing as there's such a huge gap between #8 and #4 (with Grimmjow/#6 a confirmed Adjuchas), I'd assume that at least #4 and up (if not #5 and up) were Vasto Lorde before they underwent Shinigamification. Then we have the release restraints imposed by Aizen.
Originally posted by NemeBro
Nah, I would say that is a given.Spiritual pressure with such power it could kill others with his presence?
That kind of pure spiritual power is unrivaled IMO.
It could also mean that he didn't know how to control it at that point 😬. It's vast though, possibly as great as Yamamoto's is, no doubt.