I think one of the most important future Zoro's power ups will be achieved due to Wado Ichimonji. Before facing King Zoro believed he tamed Enma but he was wrong. I think when in the future Zoro will face a similar tough situation Wado Ichimonji will help him with something completely new. If not it wilI not make sense why Sukiyaki told that Enma AND Wado are Kozaburo's finest swords. He would have referred only for Enma.