Dude the best you can say to defend Wano/Kaido/Kaido's flashback is that Oda is still saving for when he comes back with awakening and get killed by Zoro finally.
It have no clue of what Battle Cry is, what happened at God Valley, why Kaido needed his DF from Big Mom to survive and why she gave it to him, what was his relationship with Rocks and why Big Mom told to never trust him and why he kept saying pirates will betray in the moment they know they would lose when literally no one betrayed at Onigashima war.
It obvious that kaido betrayed big mom. She give him a fruit and kaido run like a rat. That's why big mom said in his alliance with kaido that he owe him a lifetime for that shit. After
what kaido done to big mom dirty. Big mom still see him as little brother. What a great older sister she is. You wouldn't think someone that value bloodline the most act like this. It
obvious that Both big mom and kaido betrayed rocks. I mean big mom betrayed Germa 66 and kaido betrayed orochi. They betrayed them cause both of them has history of betraying
someone in the past. Also kaido backstory? We already seen it in Oden flashback and Yamato flashback. What missing is his rocks backstory and oni backstory. Oni and rocks is
most important backstory in the series. Why would you want it to revealed in wano? Do you all think wano is somekind of final arc or something? Oni is related to ancient giant so it is very important. It also relate to WG. how they
got genocide or something. About Rocks backstory. I bet it is not about powerscaling backstory but backstory that relate to WG or Imu and how rocks want to replace Imu to be
king of the world. It related to celestial dragon and gorosei too. Rocks and oni can be backstory about world government and should not be about kaido and wano alone. Kaido
maybe there to be part of that story. Just like in oden and Yamato flashback. People want kaido to be doflamingo type of backstory when doflamingo backstory also is not about him alone. It also about corazon and law. Kaido is brute force of nature. Why would you want tragic backstory for him??? This is not Naruto.