Yes, that's fairly obvious by way of Marco more or less failing to do any damage to King. Katakuri is the weakest of the top Yonko Generals (note, I did not say YC1 because there is no reason why the top Yonko Generals across each crew should be linked, either in-story or out of it because it;s nonsense. Say King joined Big Mom, would Katakuri now become "YC2" and Queen "YC1"? It just falls apart like wet tissue paper when you poke it with a stick)
Marco role here in Wano is an assist to the Young Generation, he have been questioning himself what truly is his role. Marco also clearly giving opportunity to Young Generation like Zoro Sanji to beat the YC because their are the future, if Marco really want to fight or beat King, I don't think that really a problem for him.