I like to joke on Big Mom but damn. She's been fighting against 2 awakened devil fruit users. One of the devil fruit is considered broken/over powered by the entire One Piece community. They may not be Luffy level but they have shown to be dangerous. Kaido has one shotted Luffy, took on several opponents in the scabbards, got sliced up by Zoro, fought against Yamato.. like I dont know how much more do you want Kaido to do here. He's given us plenty on how ridiculous he is. I think people view yonkos as these god like figures who cant be beat.