So now the question is… where, who & when is Hiyori?
If it isn’t somebody new, there are only two girls in One Piece, that know/knew how to wield a sword: Tashigi & Kuina.
To be honest, I already have a theory that Kuina IS Tashigi who ran away to learn the way of the sword from somebody who wouldnt care that she was a woman. They just look too similar and have too many similarities. Maybe she lost her memory just like Zoro lost his sense of direction?
Cheloneuniverse 