Kaido didn't validate shit. The fact that Shanks and his crew appeared at Marineford with 0 injury is already bad sign for Kaido.
The fact that Kaido went home and never appeared at Marineford is another bad sign.
Not coincidence, the event looks exactly the same with Greenbull's situation, which is also done by same Shanks.
Verdict: Kaido got wifi diffed.
Aokiji missing a leg is a downgrade for him, and not upgrade for Akainu.
OT:
Shanks is underrated when you have plebs basically saying Shanks didn't start going after One Piece when Whitebeard, Kaido and Meme was still around. As if Shanks feared them, while actually Shanks openly fainted WB's men in front of him and sent the chicken home.
- The fact that Kaidou says he is stronger than Shanks after having fought against him is already a bad sign for Shanks.
- The fact that the boy and the assassin claim that Kaidou is the strongest pirate in the world after targeting Shanks as the first Yonkou to be taken down by their alliance with Hawkins and Apoo is a bad sign for Shanks, as they obviously studied the target in question.
- The fact that during the revelation of the rewards, Kaidou was the one whose individual strength was emphasized and not Shanks, with the exaggeration about Shanks falling on his commanders, who were already well-renowned worldwide.
- The fact that Kaidou only sees Shanks as capable of fighting against him and not superior is already a bad sign.
- The fact that Kaidou is recognized worldwide as the best 1v1 fighter after facing Shanks is already a bad sign for Shanks.
- The fact that Eiichiro Oda named chapter 996 as "the island of the strongest" is already a bad sign for Shanks.
- The fact that Eiichiro Oda refers to Kaidou as the strongest man in the world in SBS 98, discussing Gear 5, is already a bad sign for Shanks.
- The fact that Kaidou is the strongest living creature in the world above any living being is already a bad sign for Shanks.
- The fact that Kaidou explicitly declared that the one who would defeat him in the future would be Joyboy and not Shanks is already a bad sign for Shanks.
- The fact that Oden stated that the people who would appear 20 years in the future would be the only ones capable of overthrowing Kaidou is already a bad sign for Shanks.
- The fact that Oda is commenting on photos of Kaidou in the Usopp gallery and referring to Kaidou as "the invincible Kaidou" after his confrontation with Shanks is a bad sign for Shanks.
- The fact that Oda brought Kaidou and not Shanks to talk about the top of the world in SBS 83 is already a bad sign for Shanks.
- The fact that it is confirmed that Kaidou only had King by his side 2 years ago in the confrontation against Shanks and yet both King and Kaidou were not defeated by Shanks + his entire crew is already a bad sign for Shanks.
So, what's worse? You figuring out, with all your wisdom, what happened between Shanks and Kaido two years ago, something that was left off-panel in the manga (making up anything), or Oda messing up Shanks with Kaido?
Verdict: Kaido got wifi diffed.
Verdict: You don't have the panel.