-Oda didn't have Kaido defeat Oden fair and square
-Oda didn't have Kaido have the upperhand on Big Mom who was missing one of her 3 main homies
-Oda never had Luffy acknowledge Kaido's reputation as the world's strongest, not a SINGLE TIME.
-Oda only has Luffy/Zoro refer to the threat of Kaido as "Yonko", be it in Zou where Zoro warns Luffy about facing a Yonko or in the latest chapter where Luffy tells Momo you just bite a Yonko, he never says "You just bite the world's strongest" or anything like that
-Oda didn't give Kaido a single confirmed W vs another toptier
Kaido's reputation can't be more irrelevant to the current arc, it's been brought up once by Zoro who mockingly mentionned the "so called strongest" and once by Killer who called him world's strongest pirate, a grand total of TWO INSTANCES in a 110+ chapter long arc, that's a piss poor track record.
In comparison Whitebeard was repeatedly being called the strongest over and over at Marineford, by everybody and their mothers, and that's a mere 30 chapter long arc, that's what acknowledgement from the author is.
TL:DR : Kaido's folklorish reputation is irrelevant in the story, Oda has already planned to have stronger foes in the post-wano story arcs
-Oda didn't have Kaido have the upperhand on Big Mom who was missing one of her 3 main homies
-Oda never had Luffy acknowledge Kaido's reputation as the world's strongest, not a SINGLE TIME.
-Oda only has Luffy/Zoro refer to the threat of Kaido as "Yonko", be it in Zou where Zoro warns Luffy about facing a Yonko or in the latest chapter where Luffy tells Momo you just bite a Yonko, he never says "You just bite the world's strongest" or anything like that
-Oda didn't give Kaido a single confirmed W vs another toptier
Kaido's reputation can't be more irrelevant to the current arc, it's been brought up once by Zoro who mockingly mentionned the "so called strongest" and once by Killer who called him world's strongest pirate, a grand total of TWO INSTANCES in a 110+ chapter long arc, that's a piss poor track record.
In comparison Whitebeard was repeatedly being called the strongest over and over at Marineford, by everybody and their mothers, and that's a mere 30 chapter long arc, that's what acknowledgement from the author is.
TL:DR : Kaido's folklorish reputation is irrelevant in the story, Oda has already planned to have stronger foes in the post-wano story arcs