In the recent chapter, Killer called Kaido the strongest pirate. Being the strongest creature you should bet 1 on 1 is a statement carried by many through the manga. "People say", which is what Law also said. Big Mom said that Kaido is not something you can't defeat. Yet it seems his status is yet up to debate to some people who say "well, Killer simply doesn't know how strong Mihawk is", and that his hype is fake rumor.
So question, how valid are statements made by characters? Obviously, it depends on the character. But I think that Killer is a valid source as the right hand man of one of the supernova, having a lot of knowledge on characters and infrastructure of pirate crews. More so than the audience. Also, such wide spread rumors in the world of one piece have to be based on something. Why is Kaido rumored to be the strongest 1 on 1 currently? Is it merely because they don't know how strong Mihawk and Akainu are (but for some reason know how strong Kaido is) and are unable to gauge the strength as good as the fandom of One Piece?
Sure, Whitebeard's title was kinda disproven in marineford, but it's because it was officially stated that Whitebeard gave in to his age and sickness. With Akainu saying that "even you cannot overcome old age" and with Whitebeard himself stating "I can't be the strongest forever". His title came from his prime, which he carried on up until marineford. Kaido however is in his prime.
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