Seriously. Why does Kuina even exist at this point? If she was out of the picture, almost everything would be the same with the exception of Zoro not having 2001+ Ls, and Zoro's awkward interactions with Tashigi as she resembles Kuina, and even then that dynamic between them has very little value. Koushirou already had the belief of women being inferior fighters to men at their peaks, so Zoro would be the same today if Koushirou was childless. In fact, I think the backstory would be better if it was mainly about the relationship between Koushirou and Zoro, with Kuina completely out of the picture. Furthermore, Zoro's dream was a thing before their promise between each other, so Kuina has no claim of being some inspiration to Zoro to become the greatest swordsman. The origin of Zoro's dream is still a mystery. As for Kuina, she has became utterly redundant and pointless as a character.