The manga stated that Kaido fought at Gods Valley, against the Garp, Roger, and their allies. Roger uses Swords, Big Mom uses swords.
Gods Valley is where Rocks Pirate crew met their end. Chapter 957.
Now you are just trolling 100%
I am not trolling, you are just not using your brain, maybe on purpose so you can speak your headcanon.
Two guys fought against Rocks. Kaido back then was an apprentice and we dont even know if he had the DF back then or if he even participated in that fight actively because 38 years ago, Kaido could have been 10-15 years old. One hit from Garp could have taken him out and that has nothing to do with landing a clean hit on Kaido with sword.
You have 0 proof that any decent swordsman has landed a clean hit on Kaido and failed to cut him. That is a fact which you cant avoid, unless you can post some panels of swords on Kaido's body doing nothing...