User blog comment:Xilinoc/Ch. 591 - Marching Out the ZOMBIES 2/@comment-4207271-20140730141427/@comment-24113610-20140731162807

From a writer's point of view, that's highly unnecessary though. Her story is finished. I could see wanting to learn more about her bankai but bringing her back as Giselle's zombie would be way worse story-wise than just leaving her dead.

First of all, she was the strongest captain left after the head captain died. And her Yachiru persona would wipe the floor with all these characters easily. And then what? Giselle wins and goes off to fight someone else? That's not how this battle should end.

And the point of her dying was to help Kenpachi find his true power. If she comes back as an unkillable zombie, what was the point of her dying somewhat poetically in the first place? And I think during those chapters, we learned just enough about her to at least imagine how deadly she was as an original member of the Gotei 13. Sometimes writers just like to leave things to the readers' imagination, especially when you have the time constraints and short chapters of a manga like Bleach.