openings contain spoilers nowadays. Didn’t last opening also spoil Kyoshiro=Denjiro?
Anyways, Sanji and King have much in common in terms of fighting style (example: Diable Jamble). Plus, King made it personal with a direct kill attack.
One more note to everyone, I actually see Queen harder to take down. Look at his DF, he is basically a muscle mass, much suitable for Zoro who will become much much better swordsman the moment he can fully cut down him. Instead of looking at it like why Sanji gets King and Zoro gets Queen, look at it from the perspective of why Sanji gets agile sky fighter while Zoro gets extremely durable opponent. (examples include Mr. 1 and Pica, who were the most durable opponents in their respective arcs due to their DFs) (I fully believe Queen to be more durable than that “hyped” Pica’s golem)