Well, you dont understand storytelling. If Oda wanted to show us Oden beating Kaido at his best, the one panel we got could have been in his hybrid form. Was it?
Are you sure it was Kaido who played dirty? Maybe it was Orochi. Regardless, as I said, it doesnt do nothing to Kaido, he is Oda's WSC.
The chapter serves to elevate Oden, who has been shit on last chapter and as the chapter said: "if you laugh(at Oden), you lose".
Guarantee? With what, headcanon?
The more you downplay Kaido, the easier it gets to accept that Zoro is taking his head off.