Board Thread:Improvements and Issues/@comment-29325824-20200527154254/@comment-2182964-20200528212343

MASKED, page 133:

''Among the many Arrancars in Hueco Mundo, those with extraordinary ability and skills are called Espadas. Most of the Espadas are Vasto Lorde, the highest class of Menos Grande.''

Bleach, chapter 267.

Aaroniero Arruruerie is the sole exception, being a Gillian.

The databook clearly states their level and the manga elaborates on the "most" part by specifically mentioning the sole exception. The Privaron Espada are described as former Espada in MASKED on the same page. So, that would make them Vasto Lorde, too. The sole exception is, as I stated above, Aaroniero.