For those who think Kaido got massively stronger after his 40's

Who is stronger, Kaido or Shanks? I think Shanks. It was said that Shanks beat Kaido in 1 day, but Shanks doesn't have any feet. Who do you think? - Quora

Shanks is out. Only Kaido and Roger remain : r/OnePiecePowerScaling

Adult Sasuke vs Drunk Kaido - Battles - Comic Vine

Escanor & Meliodas vs Luffy & Kaido - Battles - Comic Vine

Kaido, The United Organization Toons Heroes Wiki

Why was big mom not in Kaido's top 5? Did kaido have a more intense fight with Roger/Whitebeard/Shanks? : r/OnePiecePowerScaling

Who is stronger, the Hulk or Kaido (One Piece)? - Quora

Oden vs IJ Sanji - Battles - Comic Vine

I'm calling it. Roger easily defeated Kaido here. That's why Kaido put him in his top 5 list : r/OnePiecePowerScaling

Speculations - Kaido being the strongest , is just what people say it is not a fact., Page 3

One Piece: 25 Strongest Devil Fruits (Ranked)

Even if Luffy defeat him, he will still be stronger imo. : r/OnePiece

Who wins? : r/OnePiecePowerScaling

Kaido goes through 95% of Wano arc the exact same way, except this time Luffy dies for real from CP0's interference. Kizaru randomly appears and replaces Luffy. What happens? : r/OnePiecePowerScaling