On their way to Onigashima, Oden and his men were confronted by Kaido and the Beasts Pirates in the Udon region, and a battle between the two groups started.
Oden inflicting Kaido his scar using his swords is shown.
The chapter gives us feeling that Oden would have won that fight. He was really about to end Kaido after fighting hundreds of his men and being clearly wounded. However, when Oden was distracted by Kurozumi Higurashi, Kaido struck him down.
Right now, many people seem upset that Oden could be stronger than Kaido who is known as the strongest creature in the world.
Well people seem to forget about what was said when Kaido was first introduced. Kaido wasn’t always as strong as he currently is. He was merely unkillable but he wasn’t invincible. He was defeated 7 times and was captured over 18 times!
Kaido was an apprentice on Rocks D. Xebec’s ship, not his right hand or a big pirate like Edward Newgate, Shiki and Charlotte Linlin.
20 years ago Kaido wasn’t as strong as he is now. He wasn’t a Yonko back then.
Kaido was never mentioned as being on the same level as Roger, Whitebeard and Garp. Oden was always crazy strong, not on Roger’s or Whitebeard’s level, but at least near Rayleigh’s level. Kaido isn’t even in the same generation as Roger or Whitebeard. Currently he’s about 50 years old if not younger.. Oda mentioned that he was in the same generation as Shanks who is 39 years old so he wasn’t even in his prime when he fought against Oden.