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

Trafalgar D. Water Law/History/During and After the Timeskip, One Piece Wiki

Who would win in a Yonko Alliance battle between Shanks and Blackbeard vs Big Mom and Kaido? - Quora

All feats says how absurdly strong Yamato is, and that she is Low Yonkou level. : r/OnePiecePowerScaling

Fujitora and Ryokugyu vs Kaido, King, and Queen, which side would win? - Quora

Yonko Kaido vs Yujiro Hanma, does Baki's father stands a chance against the (One Piece) World's Strongest Creature? - Quora

Is it hypocritical that the guy who preaches that Haki matters more than DFs also believes that he can create the world's strongest crew by stocking up on half-assed artificial Zoans?

Friendly reminder that almost all the evidence points towards Kaido being the strongest Yonko, and fighter, of this era. Kaido>Mihawk. Kaido>Shanks : r/OnePiecePowerScaling

What is a key weakness of Kaido in One Piece? - Quora

There is no noticeable gap between Big Mom and Kaido : r/OnePiecePowerScaling

Real talk, if Big Mom happened to vanish after Roger's era instead of appearing in the story as a current Yonko everyone would have her above Kaido like they do with Shiki