There’s too many arguments to say why Big Mom is trash lol, getting stalemated by Brooke and Monster Chopper, getting one shot by King and Queen, failing to hit Jinbe sitting directly in front of her, Her Spear of Elbaf showing lesser attack power than Dorry and Broggy, etc.
And Kaido is equal to her. These are not Whitebeard level feats. Lol