User blog comment:Mrlmm0605/Let's Talk Bleach!: Part 8 - alphabet 2/@comment-44061-20150813224134/@comment-44061-20150813234946

You cant qualify the passage of time in a flashback in universe so there is no point there. As Far as the Arrancar goes there real life existence has spanned about 9 yrs and in universe it was about 2 yrs. But more importantly using them that also proves my point, by the nature of the existence there isnt much backstory beyond the emergence into existence or power. At best you get insight into their character. Once again the vast majority of them are gone. One thing is similar between them in the sternritter they were both the big bads of their arcs and thus treated the same way. They also like the sternritter have people up in arms that they werent featured in one way or another. My point stands. Why assume that they would, when its clear that this series just isnt the type of manga where you get all this character development from bad guys that really dont drive the story? In this instance that would only refer to Aizen.