Through the entire battle between the Red Scabbards and Kaido, Kaido keeps commenting that they can’t compare to Oden and that they are using different sword techniques than his (meaning he remembers Oden’s technique) and he calls their attempts to copy Oden (which they were never formally taught) a cheap imitation.
I think this is all setting up a moment in the coming Kaido vs. Worst Generation tag-team (Luffy, Zoro, Sanji, Law, Kid, Drake, Hawkins) where Zoro triggers Kaido’s Oden PTSD.
After defeating Oden’s Scabbards, Kaido is going to fight against the “whipper-snappers” who dare challenge him and beyond his furthest imaginations one of them attacks him with Oden’s sword Enma (until now, the only sword to injure him), which contains Oden’s Will (per Kawamatsu’s comments in his flashback in Ringo) who has not only actually been trained in Oden Two-Sword Style, but has “upgraded” it to a three-sword style.
I’m not saying, nor do I believe, that Zoro kills Kaido or lands the finishing blow – but like how the Red Scabbards ambushing him gave him Oden flashbacks than enabled him to be injured, what if Zoro’s attack causes even greater trauma and enables Luffy and co’s attacks to be that much more effective. Essentially, Zoro triggers his Oden PTSD to such a degree that it enables others to land solid blows and Luffy to finish him off.
*Theory by theschulk51
