It's not true. Big Mom is a 4.3b Emperor of the Sea who literally mirrors Kaido in terms of narrative and has been explicitly put in his level more than once. You guys seriously need to stop overcomplicating such simple axioms and read this story with some perspective of how Oda writes and depicts his big picture; otherwise you necessarily need to bias and lie to yourselves because otherwise nobody can make any sense out of a half-dead Kin'emon surviving Kaido's infused kanabo without losing consciousness, for example.
"King fight zoro better than kadio and big mom", yeah, then maybe your reasoning should be that Oda doesn't give a damn about your power scaling obsessions instead of thinking a 1.3b commander is stronger than one of the kings of the New World and can perform better than two for any reason that isn't on the whims of narrative.
Or bounty does not mean strength. Look at Bellamy and foxy guy in preski. Bellamy have higher bounty than foxy but foxy is stronger than Bellamy in feats wise.
Edit: To become emperor , you need territory and army. Nothing do personal strength themselves unllike admirals know as strongest fighters/force for world government.
Luffy become Emperor after defeating katakuri. Luffy already have army like starwhat fleet before.
Or you are overrating emperors hype. Same big mom canβt do anything when king kick her ship off waterfal.
She would die 4 times if not plot/luck save her. Got drown in once. Got almost drown by rooftop 5. Can be starve to death by Queen by not giving her food. Got kids worried when big mom fall from great height.
Big mom have so many bad feats compare to king.
Oda say King is God race thing.
I can make sense half- dead kinemon survive kadio advanced coc club. Kadio is weak compare to admiral. Kuzan rip jonz arm off while big mom canβt serious injure Kidd even he is offgurad. Akainu kill ace and cause to whitebeard to become half dead man as where Blackbeard pirate start it.
King durability already better than kadio. Zoro cut kadio easily just fine but have hard time to cut king.
You can believe yonko are stronger while the feats will disprove you