Right Hand is practically Vice Captain- or well, no. Right Hand has to do with more about strength and capabilities. Vice Captain is leadership title, so yeah, King has a title far superior to Vice Captain in terms of strength portrayal and that's what Oda gives a fuck about, too, and that's where that cover page comes from.
So unless you think Katakuri = Smoothie because they're both Sweet Commanders, spare the retardism.
And ok bro, Kaido could not even beat a half dead, 30+ bones broken Zoro without getting overwhelmed in CQC, getting himself scarred for life, bleeding all over and huffing like crazy.