Kid fought alongside Killer against Kaido and lost...
So Luffy fighting alongside Zoro against Kaido and wining should be easy to to accept ( Luffy acomplished everything in what Kid failed don't forget that this is how Oda compares them:unsure: ) but ....it involves Zoro a character who for many is destined to be below Kata in EoS even....
It is just the idea of " he must not be strong cuz " bla bla my bias .

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When Oda revealed that Kid and Killer fought Kaido the community should have started to accept that Luffy and Zoro fighting Kaido is more than possibility.