Sorry this is a stupid theory I came up with yesterday about Tashigi and Kuina…
I was just wondering when Kuina fell down the stairs what about if she didn't die rather she was just knocked out and lost her memory the first thing she saw when she woke up was her old swords so she took them and left the house now trying to train to be a good swordsman.
Maybe they're the same they look alot like it, and they both like sword fighting.