The scabbards barely cut Kaido. Paper cuts at best and stuff he casually healed from.
Zoro's Tatsumaki overpowered Kaido's tatsumaki and cut his scales. Ashura perma scarred him.
If you're talking about the Rengoku Onigiri, there was no koka on the swords.
Yes zoro is overall stronger but were specifically talking about armament
And zoro and the scabbards were able to hurt kaido just as much as eachother with them being able to make kaido bleed but not doing any legit "deep cuts". Again specifically when it comes to armament
Zoro who likely knew how to use barrier armament on his swords even before wano was not able to cut kaido like the scabbards before unleashing more of enma. While zoro's attacks are obviously stronger than someone like kiku's they were not actually able to hurt kaido before enma because of armament
Unless zoro never really had legit mastery over barrier armament prior to enma and the way they were all cutting kaido was that with penetration armament being ability needed to scar him
And you dont need hardening on your blades to use armament
Rayleigh has everything Oden had and then some with the Internal Destruction CoA. It's obvious who was stronger and Oda even went out of his way to show that with this colour spread.
Rayleigh has not shown to be able to have the voice of all things or coc coating (if that is what's needed to scar kaido). And if internal armament is needed to cut kaido than oden has definitely shown it
The color spread highlights right hand mans not strongest characters to be under each leader. Same reason Marco is on it but not oden (plus with Oden just being dead๐ฟ)
So what does Oden have over Rayleigh, the person who's been compared to Shanks and Whitebeard
Hype by the world's strongest man, world's strongest creature, pirate king, all of wano, shanks, all had the most massive hard on for Oden and his hype. Even the marines acknowledge how much they all were so hyped on him. Man was an enigma just as the top captains of his generation and still would've been to this day if he was still alive. The man literally popped out the pussy built different.
Rayleigh was definitely a top tier but his hype doesn't compare to odens