You making not a lick of sense
The centerpiece of the very next arc, are the lunarians, who are called the ultimate weapon/peak of humanity, the trait they use for this from lunarians is the defense
King already had the signature lunarian flame from the early chapters of the raid. So oda hat that idea clearly in the mind even before a fight
Also, the LITERAL chapter of this scan is where Marco says he is out of this fight and leaves the younger generation the stage, so no King was not supposed to fight Marco in this chapter even hypothetically in odas mind