Literally every single chapter Marco says he is tired, or thats things are difficult, or he is serious or gets hit, guess what?
Exactly, you have King and Queen fighting him together, this chapter shows that in the best way possible.
Even then, King didn't had to fight Marco and Sanji at once, or alternate between them, like Queen did, Hybrid is more than justified in this case because Queen had to keep up against two opponents.
1vs1 Marco showed no difficulty, literally nothing happened, but he also did nothing against, we barely saw him 1vs1 against someone (just a panel of full Zoan King shotting things at Marco but it just passed through his DF).
2vs1 was when things actually happened to effectively bring him down that fast, even at these moments Marco was treating King and Queen on basicly the same way while fighting.
(We may even consider he using his healing powers on Samurai or getting hit by Queen's plagues until Chopper healed him)
So overall i place King and Marco as equals, i think thats pretty fair, and Queen is very slightly below them.