1. If Zoro kills Kaido, then Luffy doesn't. You didn't disagree with me lol.
2. It doesn't have to be CP0. It could be, but they went into this trying to do business with Orochi and even when the battle started, figured that the side with two emperors losing was impossible. So you have nothing to stand on with them capturing Kaido right now.
3. Lol, so Zoro kills on panel
And he also has been confirmed to kill a named character, from Baroque Works. But you're going to say that he hasn't done both at the same time before, because you're going to keep moving goalposts in order to disqualify the possibility of something new happening, even though Wano was stated to have a surprise ending. Toei, OP Magazine, Vivre Cards, and the One Piece Japanese website are all hinting for nothing, or have no idea what they're talking about. Everything we literally see is a coincidence.