@Daz:
So basically, Nanaos mother blamed the all-women family curse (Where did this come from?) on the family sword (why?), and wants to get rid of it.
So Shunsuis sword spirit spawns ANOTHER sword spirit (how?) for the express purpose of hiding the cursed sword (how do you hide a physical Zanpak inside the spirit-version of another zanpak?) because that might make the curse go away (why? Just because its hidden?)
Appearantly Nanao knows all about the curse, the sword, her mother, Shunsui not wanting to give the sword back - yet we still need to go over the whole thing purely for the benefit of the readers. its literally "AS YOU KNOW", "YES, I KNOW".
So you are left with the same questions as me. Mainly the whole thing about a zanpakuto spawning other just because the owner wanted so… why doesn't everyone has 100 zanpakutou with 100 different abilities then? Shinigami can't dream big...
Another thing, this screws the time line SOOOOO badly.
- We see Shunsui as a kid when his brother was already married.
- We know his brother died soon after being married.
- We saw Shunsui as a young adult was still an academy student (so he is not a Hitsugaya who became a captain while being a kid)
- We know Shunsui has been a captain for at least 200 years by now
- 100 years ago, we saw Nanao was still a little kid.
So either Nanao's mother makes Rouge look like a halfassed pussy and held Nanao in her womb from over a century or Kubo screwed up.