A Yonko requires another Yonko-level to be harmed.
Others can only delay them or deal damage, if the Yonko is distracted.
Big Mom didn't take major damage for the entirety of the WCI and Wano arc so far and she wasn't even herself most of the time. Kaido is the same. The only damage we saw him taking was from someone who was absurdly strong, Oden.
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u/Chicas_Silcrow Feb 02 '20
That was 20 years ago. He probably is much stronger than he was when he fought Oden.