If ZKK is so controversial and there are so many people denying it, why would Oda do it? There is room for plot twists, but if they are as outrageous as ZKK, they would backfire horribly for Oda.
Ultimately, Luffy is the MC and the most popular character in One Piece. He's also the one who's been fighting kaido for most of wano. The editors probably would never let Oda draw Zoro murdering someone on panel, let alone stealing what should be Luffy's greatest victory up to this point.