In Chapter 1006 Marco deals a blow to King and Queen.
Before Queen can fire his laser at Hyogoro, he gets struck by Marco with Hoo-in, which causes him to cough up blood.
He angrily asks what that attack was as Marco reminds him that he was fighting him, and he won’t be able to think about the samurai until he deals with him.
Marco dodges Queen’s laser attack while King jumps down and cuts off Marco’s left wing.
Marco regenerates it though and fires a Bluebird at King, knocking him into a building before he gets kneed in the face by Marco.
Queen turns back to normal as he walks over to Marco, but Marco launches him back with Ongle.
Marco effectively held off and overpowered the All-Stars King and Queen at once—the two strongest of Kaido’s subordinates that have bounties over one billion—, sending them flying with his attacks and (in Queen’s case) repeatedly drawing blood.
Marco did note, however, that fighting them at once was tiresome for him, and he did sustain some light injuries amid the engagement.
It looks like Marco’s flames eat up stamina to keep them going. That seems to be the only drawback to his overpowered fruit.
Anyway it makes Marco’s performance even more impressive to me, knowing he used a lot of flames to counter Big Mom’s Homies and to heal everyone there even before taking on King and Queen!
So glad Marco is proving how much of a beast he is.