Board Thread:General Discussion/@comment-12425721-20130716195655/@comment-8986886-20130807151917

Sternritter M wrote: Regarding the devour of Hollows - Grimmjow devoured Hollows and gained their strength too, when he was an Adjuchas. I don't know if Arrancars can to that only up to the Adjuchas-level, but I would assume they can do that as Arrancars too. Unless I've missed something on the Hollow page.

When Grimmjow met the group of Adhujas, who would later become his Fracción, they decided to continue to devour Hollows, in order to become Vasto Lorde. After having eaten more than a thousand Hollows, without their powers increasing noticeably, the other Adhujas came to the conclusion that each individual Hollow has its own maximum power potential, which it cannot surpass.

If Grimmjow has already reached his full potential, it wouldn't do him any good to keep feeding on Hollows. If he hasn't reached his limit yet, he would most likely be forced to devour many hundreds, if not thousands, of Adhujas to become noticeably stronger.