I hate oda for just making the yonkos only about strength
bigmom and kaido has such an interesting past like why did kaido become suicidal, why did he stop believing himself to be joy boy,how did he even know about joy boy , who were the 7 other people who lost to, why did he tell Yamato that wano was special, who did he fight to be able to be renowned at the wsc even with whitebeard alive but oda used the stupid wano samurai and flying six to waste pages when we could have gotten a good backstory..
guess oda wanted to make kaido like aizen (cool villian with no backstory) only to end up terrible