Imagine a hypothetical situation, on a random day in the morning, akainu puffs out his chest that is full of air, in his office and says:
A being capable of bringing me down doesn't exist in this world!!!
The forum would be exploding, because a higher level is admitting superiority to everything else.
Admirals fans would be crazy, using this as an argument for everything.
But let's ignore it because Kaido said so.
I say that Doflamingo wasn't saying that, katakuri wasn't saying that, Hody on Fish Island wasn't saying that, crocodile wasn't saying that, Lucci wasn't saying that.
But let's ignore a statement from one of the top 4 pirates in the world who is quoted as the strongest man in the world and the WSC.