Board Thread:Improvements and Issues/@comment-15519592-20150125090311/@comment-26520693-20150622083737

Xilinoc wrote: Arrancar can be naturally formed as well, you know. They're not as powerful as they would be if created by the Hogyoku, but Hitsugaya noted this exact fact during his overview of them.

And if you'd like further proof, that very chapter showed an Arrancar begging for his life before Nnoitra cuts him down, so there's your proof.

An Arrancar is a hollow that achieves soul reaper powers, and you are saying it as easy as them pulling off part of their mask?

Well there is no need for normal hollows then, every level above gillian should rip off their mask and become an arrancar so they can achieve a release and a zanpakuto.

I am sorry, but I have read the manga at least a dozen times and I have no idea where you are getting this information. Arrancar's are made by Aizen. Gillians become Adhuchas and Adhuchas become vasto lordes, but nowhere in the series is there proof an actual arrancar has existed before Aizen. Issen Kurosaki did mention that he knew what an Arrancar was, but that it had to do with a type of fusion between a soul reaper and a hollow.

You should pay closer attention