Considering Sanji turned out to be a Super Hentai Sentai, Oda might troll us and have Zoro turn out to have completely different lineage somehow. It won't explain why Ushimaru and Ryuuma resemble Zoro and all the other samurai and Shimotsuki stuff setup with Zoro but I wouldn't put it past Oda to do this either.
In before Zoro's family are expert navigators/chefs/Okama or something ffs lmfao.
I actually toyed with a theory that Zoro is somehow from the distant past, as in maybe Tokis time or before or later and thats why we've not even met another single fucking Roronoa yet and nobody has ever heard of them apparently?
I'm coping extremely hard right now.
I don't even expect Mihawk to get an actual backstory anymore either.