Not if he has Marco to deal with. Marco can hold off even the top-tiers. So if King wants to help Queen, he must do something about Marco first. King right here put Marco on hold, went to rescue Queen and helped him dominate Sanji, and quickly tried to eliminate Zoro although he was ultimately stopped. Guess what? Katakuri couldn't even notice Flampe and others even when he was utterly dominating Luffy. King fully assess the situation on the live floor and even acted on it while fighting another YC-1, and he isn't even going all out.