That applied to WCI, as Sanji did neg diff Big Mom with a cake that arc. Now in Zoro's case and Wano, the neg diff on Kaido will involve swords and a rolling head.
Seriously tho, Kaido vs Zoro second confrontation is inevitable. I just think it's sad most Luffybros can't see it and won't enjoy the epic duo moments of Luffy & Zoro. I think it would be fitting for the future PK and WSS to defeat the WSC together, and that would leave them more room to grow against other opponents, even if those opponents might be weaker than Kaido (except maybe the very last ones).:cheers: