you have no way to prove your second paragraph when you claim kaido can swing his tail and kinemon dies. Why do you think kinemom would even get hit by his tail? He’s fast enough to react to boro breath, shouldnt he be fast enough to dodge? How can kinemom have the speed to react to kaido, the strength to pierce kaido, but somehow die instantly if kaido swings his tail? Thats not adding up with whats shown in the manga dude
as for why kinemon stabbing kaido matters? You dont see why being able to stab someone to the point that they scream in pain and fall down on one knee bleeding is useful?
Kin'emon with ALL THE SCABBARDS plus the PAIN FROM ODEN'S WOUND is what made Kaido scream. ALL THIS COMBINED.
And yet ALL THIS COMBINED was WEAKER THAN ONE ATTACK FROM ODEN.
So to say that Kin'emon should be useful to a fight against Kaido, he should have MORE ABILITIES. him cutting fire doesn't mwan he's somehow a trump card in all this then right? Good.
So let's get into All his stats then. Is Kin'emon physically stronger than Kaido? NO
Is he faster in reaction? NO. Is he faster in attack? NO. Is he more durable? NO. More Endurance? NO. More attack power? NO. Hmm. What else? Please present what stats kin'emon has to be the so called trump card in this Kaido fight.
Remember, we've established having one ability to counter one ability isn't jack shit. According you, Kin'emon has enough travel speed by his legs to dodge a tail the size of multiple building coming crashing on top of him. His running speed or at least movement reaction speed can dodge a moving skyscraper launching directly at him.
Him cutting the Fire breath isn't the same. Because that doesn't require him to run. The speed required for him to cut the fire breath is that of his hands swinging from up to down. The speed your arms move is different from your legs right? Especially when you have to dodge a fuckin skyscraper sized attack right?
Do you see how linearly you think about these things? Suddenly swinging a sword qualifies as enough speed to translate to actual movement speed from your legs according to you.
Maybe you haven't been powerscaling a long time so you don't really understand these things.