The only sword I can see Zoro losing before EoS is Sandai Kitetsu, and I think it will get broken so that Oda can replace it with Nidai Kitetsu. I think he will also lose Ichimonji too. When he has his final clash with Mihawk, he will use something like 30,000 pound cannon in Asura mode to finish off Mihawk, and a few seconds later when Mihawk dies and Zoro therefore becomes WSS, Ichimonji will then break because of the pressure put on it and it will only get destroyed when Zoro wins since he will have fulfilled his promise to Kuina. He will then replace it with a sword possessed by the Gorosei(who Luffy will have beaten), Shodai Kitetsu.Yea but no other people will rust swords but him. But people will snap them. Which is fixable.