Questions & Mysteries Oda missed out on the opportunity of giving us a flashback of what happened between Shanks and Kaido during Marineford.

[Elias50]

One of the many unsolved mysteries was how Shanks prevented Kaido from going to Marineford. With this chapter showing Shanks's reaction to Luffy defeating Kaido and becoming a great pirate, it seemed the best place to give us the flashback. I don't see anywhere else Oda could fit this flashback or interaction between Shanks and Kaido, which means it'll be something we'll never know.

 

[Herrera95]

He just showed what happened before the story begins. He can still show this whenever he can.

He didn't lost a shit. One Piece didn't ended.

 

[Ryuarashi]

One of the many unsolved mysteries was how Shanks prevented Kaido from going to Marineford. With this chapter showing Shanks's reaction to Luffy defeating Kaido and becoming a great pirate, it seemed the best place to give us the flashback. I don't see anywhere else Oda could fit this flashback or interaction between Shanks and Kaido, which means it'll be something we'll never know.

It was not important to the story, what was important was a proper Kaido flashback

 

[The_BlueOGRE]

what is it you wanted to see in it? they met, they fought, they stopped, and went home to get drunk (not saying which crew is getting drunk)

 

[SakazOuki]

Kaido probably got scared and took off. He took a long journey to mf then tuck his tail and ran back to his safezone.

 

[NAMELESS]

Shanks will probably have a flashback about Kaido during his fight with Luffy.