What do you mean by, "You don't want to see it," when I've literally been quoting a panel of Marco fighting King in a one-on-one setting. We also saw Queen just watch Hyogoro wipe out the floor without doing anything, and you're telling me to believe he's been fighting Marco because he said something that doesn't even imply what you're saying.
And what does Marco reminding Queen that he's supposed to be fighting him imply again? Do you suggest that Queen forgot Marco exists after taking a small break from the fight and Marco had to remind him that he's his opponent?
Yup, Queen did not engage Marco after chapter 1000. King fought Marco the entire time until chapter 1006 in which Marco attacked Queen for targeting Hyogoro. Marco grow that tired because he was also helping the fodder via flames while fighting King. Do you think he can just fight on par with a fellow YC1, who's more skilled and has physical states comparable to Zoro, without suffering the consequences?
There is nothing unreasonable about King being able to fight an exhausted Marco. We saw him fight Marco even after Queen started fighting Chopper and Sanji, he was totally fine fighting against Hybrid Marco. He also took two of Marco's strongest attacks shown in base and got back like nothing happened.