Board Thread:General Discussion/@comment-27565137-20160320034902/@comment-27392440-20160326182000

I don't think the hole or mask would ever come back as they symbolized being unable to handle their own pain/emptiness, just as arrancar, as the advanced state of a hollow, becomes more human I think the end form would look human as well though possibly with some appearance changes that represent evolving to no longer be affected by what your soul couldn't handle as a hollow and an evolved zanpakuto that represents both powers (with powers of a more complete and powerful shikai/bankai and resurreccion that makes clothes rather than monstrous changes similar to Starrk and Hallibel's forms), other than that I think you pretty much are right though there might be further evolutions even than that (I think I once saw a hollow with more than one hole and Aizen went from one hole to three when he evolved meaning it might be possible to get multiple "aspects of death" as Barragan once hinted at there being but that's just a personal theory). I think it's incorrect to say arrancar can't grow (Ulquiorra was able to grow into segunda etapa and there's no evidence to say Nnoitra went from number 8 to 5 by the hogyoku or even that it helps naturally made arrancar), my theory is that it's more that they can choose to be more human-like and gain power while giving up inhuman traits like high speed regeneration that go beyond merely empowered human capability and likely act as a constant drain on their power