Despite not being an Espada, Wonderweiss' spiritual level is ranked as one. Unlike normal Arrancars, Wonderweiss was modified by Aizen specifically for sealing Yamamoto’s powers. Moreover ...

Hollows in Hueco Mundo can converge to form Menos, gain power, and reach Vasto Lorde status, like Espada Arrancar under Aizen's army. Privaron Espada like Mosqueda, Sanderwicci, and Del Socaccio ...