He did cut Kiado wiith all 3 swords and why would Zoro suddenly turn into a 1 swords style swordsman when we know he is at his best when he uses all 3. Some people are too damn desperate to drag Zoro down at any cost
Zoro was over restricting Enma that is why he wanted to loosen that up despite the risks involved with it they were dealing with two yonkos after all, there is nothing more to it than that we had almost whole chapter dedicated to how this sword works
In case if Greenbull have a mystic zoan time based df?
With legendary mystical beings can control time?
(Since we having with Sengoku a deity like Buddha or with Kaido a chinese Dragon, I doubt Oda would have problems to make a mystical beeing based on time power).