Broken Hollow Masks?
As of right now, I'm on episode 244 of the anime and chapter 331 of the manga. And in that time, I noticed a glaring inconsistency concerning Hollow masks.
So far, I'm not entirely sure how the Hokyoku works, but I assume it does break a Hollow's mask, to a certain degree. That explains why ll the Arrancars have mask fragments.
BUT, earlier in the series (episode 3 of so), Ichigo fought a Hollowified Sora. In the process, he chipped off part of the mask, revealing Sora's face. Later, after Orihime stops him rom going after Ichigo, Sora's mask is completely destroyed. Does this make Sora the first Arrancar? of is there something deeper involved?