Thats because reality is that Kaido was pretty much silver medalist.
Kaido and Big Mom never got portrayal Roger / Whitebeard did . There isnt single sentence where Kaido / Big Mom were were said to be Rogers equal , that accolade was meant for Whitebeard.
Kaido was just next best thing after Whitebeard death thats whole deal about him being world strongest pirate.
Not just Whitebeard himself but Whitebeard pirates as whole were stated to be strongest pirate crew. WHitebeard lived his life as a true pirate gaining territories and influence around the world while Kaido just remained in Wano an isolated country . Thats also reason why Kaido downfall never had much impact as Whitebeard downfall did.
Kaido and Big Mom downfall was just an end of yonko, Whitebeard downfall was said to mark end of an era .
Even in death Whitebeard was never sullied. Kaido and Big Mom got trashed and defeated, even at end Whitebeard body was never shown hitting the ground , he died while standing , his life simply expired . His dying words left a huge impact on one piece universe and reignited the flames of pirates all around the world.
Whitebeard downfall in fact marked an end of part 1 of One Piece, Kaido / BIg Mom downfall didnt mean shit and manga went on with Egghead arc.
Even at Wano arc pinnacle of Kaido / Big Mom wank , Oda still shit on them by giving them inferior bounties to the Whitebeard. So not even recency Odas bias put those 2 above likes of Whitebeard.