SHs dont need to be YC1+ level to face Kaido.
I just want to see their team work and piss off Kaido, just because he said Samurais are pretending to be strong. It will send a strong message that even weak ones have their will and determination and with enough struggle and dedication they can take down enemies much stronger than them.
Just a few combo attacks like Ussop holding Kaido with his tricks, Nami using Zeus' lightning,
Kaido goes to attack Usspp but Robin holds Kaido with her DF hands and then Franky launches a beam right at Kaido's face followed by Sanji's ifrit janbe.
It is not about damaging Kaido the most, just that the sheer resolve of his opponents making him scared for a moment.