Ay yo man... you do realize that invisible CoA is a thing right? Koka was never the only way armament haki could be imbued with something, that’s been the case ever since it was first depicted on panel:
And Rayleigh literally described it as “an invisible armor”.
It doesn’t matter how durable Kaido is, he’s still getting diced without the requisite haki to protect him. Law’s amputate slash ignores natural durability. When seastone chains are getting diced via amputate what makes you think a defenseless Kaido isn’t ending up the same?
And the poll should be made public lmao, too many people capping at the Olympic level right there.
Also clear-cut ad populum fallacy right here ^