Lmao because the point isn't to just believe any idea that sounds ridiculous. There aren't nearly enough convincing pieces in the story placed by Oda for us to believe Brook would just randomly appear as the grim reaper, if there were we'd have predicted it a long time ago. Comparing the two theories just tells me you don't think ZKK holds any genuine weight. It does. I don't believe zoro kills kaido because it sounds cool or it's the most crazy idea; I believe it because Oda went out of his way to set it up.