The narrative (and even Kaido himself kinda) disagrees with that but regardless of that, why do you think Kizaru - who has no CoC or DF awakening as far as we know - can beat someone who has all three advanced haki, an awakened mythical zoan DF, and amazing portrayal as both a Yonko and the new Joyboy?
A lot of us expect Akainu to be Luffy's main challenge in the Marines, so why is Kizaru elevated to such a level for you?