Board Thread:General Discussion/@comment-12425721-20130716195655/@comment-5028409-20130810015316

CedricP wrote: I remember that a Privaron Espada, the one who fought with Ishida, said that an Arrancar couldn't go back to his form after Resurrection, but i might be wrong. Besides, MAYBE, if I'm right with what Segunda Etapa means, Ulquiorra was the only Arrancar able to archieve SE because he was the strongest of the non-Vasto Lorde Arrancars at the moment, and he could still evolve. But I may be wrong, Ulquiorra might have been a Vasto Lorde and even there could be higher steps in Menos Grande evolution unknown by the Shinigami.

WRONG! An arrancar can return to their human form anytime they want. Cirucci was talking about an entirely different thing. She told Uryu that any damage done to their resurrecion form is permanent e.g removing her wings at the time was comparable to losing a limb. If they lost an arm in resureccion form, that arm will not regenerate on its own unless they have real regeneration ability like Ulquiorra.

If they couldn't return to human form indefinitely, then it would defeat the purpose of being made into Arrancar