Tbh I don't mind if Zoro doesn't have a back story, I meant I'd take it but if Oda doesn't do it then well, that's that. I meant Zoro doesn't need to be a descendant of someone important to make him relevant. Zoro's showed that he's a self earning guy since the start with his crazy trainings. Not everyone needs a complex past. And Zoro doesn't seem like a guy who'd care about his past/origin that much.
I'd prefer an explanation over the illegal escape of some Shimotsuki members to East Blue tbh. Maybe Zoro's parents were part of it and they'd get fleshed out. And while at that we can have some stories about Ryuma as he's also a Shimotsuki and how he shocked the World with his fights against the WG.
I'd love it if the story of the Shimotsuki gets connected to the plot about Wano's closed border policy gets explained at the end of Wano because other than that we'll have to wait until EOS.