ODA is a mangaka who chooses story over power level. In order to fit the story he changes the power level as he sees fit. So if he wants sanji to hurt kaido. He will do it by simply showing that sanji also has Adv CoA.
I am not thinking from a power level pov. I am thinking from story pov. Luffy, Zoro and Sanji teaming up to take on Kaido would be a story to tell. ( Also Oda gave kinemon haki powerful enough to hurt kaido why not sanji)
Marco, Law and Kidd vs Big Mom (Not a fight to defeat her but to hold her down so that she doesn’t interfere in Luffy’s battle)
Luffy, Zoro and Sanji vs Kaido
Yamato vs King
X Drake vs Queen
Jinbei vs Jack
Franky vs Who’s Who
Brook vs Sasaki
Robin vs Black Maria
I assume u haven’t seen the movie of Turles. Let me tell you what Turles say to Goku. He says the following:
In the Dragon Ball Z: Anime Film Comics, it is stated that the reason why Turles and Goku look alike is that the facial patterns of each warrior are similar within the low-rank Saiyans...
Objectively Boa Hancock is the most beautiful human in One Piece. But Wano is a closed country so the world hasn’t seen Hiyori. Objectively Hiyori is the most beautiful woman in Wano.
So only after Wano opens its borders and people see both of them can we know who the general populace of One...