I think Marco > King is confirmed with this chapter, they always attack 2 v 1 against Marco, King's attacks were shit, Marco take it like its nothing, while Marco also showed far better speed, defense and CoO Haki than King ever has.
Perhaps King has better AP but still Marco was ragdolling King with his AP while dealing with Queen at the same time, imagine if he didn't need to deal with Queen in here, King would be toast.
Physical strength Marco > King, imagine if this is 1 v 1.
King's attack is shit again;
King shit his pants;
King shit his pants again;
Not even once we see King making Marco cough blood,
Not even when Queen was helping King in 2 v 1, the fact that even now King still needs Queen's help to do damage against Marco
tells a lot.
Marco is soloing King + Queen since Chapter 1000, for 20 chapters its 2 v 1, and King still needs 2 v 1 attack to make damage against Marco.