Which, if true, won't go to Zoro either. Kaido is already confirmed to be stronger than Mihawk. Properly translating the japanese panels, which
@Sasaki Kojirō made good effort in doing so, leaves no ambiguity regarding Kaido's title, with even Zoro calling Kaido the strongest, without the "so called" part.
Yes, Kaidou is Stronger than Mihawk Physically, He is Stronger than Everyone Physically
But Kaidou's Fighting Style isn't Superior than Mihawk's Fighting Style
It's not even Superior than Oden's or Roger's or WB's or Shanks or Blackbeard ... etc
Kaidou's Title means He have Highest Doriki, He is Strongest Creature
But We Rank Characters based on who can Beat who, and Kaidou doesn't have Best Fighting Style
Don't confuse between Doriki (Physical Power Level) & Fighting-Style
Black Maria's Doriki is obviously Superior than Robin's for Ex, but Robin got the Superior Fighting Style hence why Brook told Maria "Run"
Just like Crocodile said Mr. 4 is Stronger than Mr. 3, He meant Physically, cuz it's obvious Mr. 3's got the Superior Fighting Style (His DF)
And there are Dozens of other Examples
WB is Strongest Man because He has a DF capable of Destroying The World, meaning He have "Strongest DF-Based Fighting Style"
Mihawk is Greatest Swordsman because He has Unrivaled Sword Techniques, meaning He have "Strongest Weapon-Based Fighting Style"
Kaidou is Strongest Creature because He have Near-Invincible Body, meaning He have "Strongest Doriki/Physical Power"
Kaidou's Lost in a Clash against Luffy, He also said He doesn't mind Dying against Oden, He couldn't stop Asura, All of his Techniques were Countered by Someone or Another ... etc, So He is Strongest Creature & for now, i Put him Top 5, but He simply doesn't have Best Fighting Style, you think Roger or WB or Shanks would Lose against him in a Clash of Weapons? You think Zoro can Counter his Dragon Attacks but his Top 5 can't?
Kaidou is Physically Stronger than his Top 5 & Everyone Else
But when it comes to Fighting Style, They are Above him, as Simple as that
And Fighting Style is what determines the Winner, you're either Superior than your Opponent in Combat or You Counter him
(Unless They have a Defense that cannot be Broken, similar to Zoro vs Mr. 1, but in Kaidou's Case, We know that Oden can Kill him, the other Four are No Exception, and same goes for Actual Strongest Swordsman & possibly others)