Trust me, the common idea was that Zoro behead Kaidou and we found countless references to it, but we were blinded by his connection to Wano that we thought it must happen there, but I found very strong evidence that ZKK gonna happen in Final War instead (I promise it's gonna be mind blowing)
I won't share theory now cuz it's part of my full op analysis, but I can give u one small hint that agrees with what I said
Did Ryuma behead Dragon before or after defeating Cyrano (Western Master Swordsman who looks like Mihawk)?