Dude, Luffy said that he was going to beat Kaido and then got immediately curbstomped. Stop with this nonsense that Zoro absolutely must be immune from it.
As far as Ryuma and Oden, no, there aren’t any parallels between them and Zoro, at least nothing beyond superficial things. Zoro carried their swords, that’s it. As far as Ryuma cutting a dragon, Zoro did that on Punk Hazard. And it’s funny how you mention Enma being “the sword that mortally wounded him and was untouched for decades,” which is a blatant lie on two counts. It didn’t “mortally wound” Kaido, and it wasn’t the sword to do so. It was one of two, which severely undercuts its significance, on top of the simple fact that simply holding the sword does not make him as strong as Oden, who sailed the entire world on Roger’s ship and was in his prime when he fought Kaido.
Furthermore, Oden does not parallel Zoro at all, he parallels Luffy. And speaking of Luffy, it’s funny how you put more weight on Zoro’s words, than on Luffy’s words, who has an actual feud with Kaido, as opposed to Zoro, who Kaido wouldn’t know from a bag of dirt.
Stop quoting me, man. I’ve had this debate numerous times across numerous threads here, and I’m not interested in relitigating it for the umpteenth time inside this echo chamber.