People apparently confuse "ZKK" Theory with "How & when will ZKK happen" Theories
The ideas & scenarios were very diverse, some said it will be saving Capital from Kaidou, some said SHs team-up on Kaidou with Zoro delivering final blow, some said it will be Public Execution, some said it will be End of Act 3, some said it will be in Chapter 1049, some said it will forge Black Sword, others said it will be related to Shinigami Plot ... etc
These are simply guesses about how the Scene will be executed, but no one can predict how Oda picks the timing, paneling & exact scenario.
The only thing that is constant & unites all ZKK Theorists is the beheading of Kaidou by Zoro.
This Theory is not proven wrong until Kaidou is Confirmed Dead or Confirmed to not appear again.
SHs might indeed leave Wano, but if Kaidou appears again sometime & hinted to still have a Villainous Role to play, you think we won't think about ZKK? It's like saying Minks won't get their revenge on Jack because Zou Arc ended & Zunisha already crushed him & his entire Fleet, even though the guy was clearly Alive & prepared for future appearance
Did ZKK Theorists fail multiple times at predicting the timing & circumstances of ZKK? Yes, all the time
Were they wrong about ZKK Happening? Not at all, the Theory still stands
