Kinda weird seeing the argument "Once you know the Lunarian gimmick, you can win".
Why do we assume the seraphims/King has any reason to remove their greatest attributes to combat opponents?
If you can't hurt them with their flame on, that just means that they gatekeep their own defeat. Relying on them needing to remove their flames to "speed up" to combat their opponents is just wishing thinking in a hypothetical battle, when they can just tire you out and win the battle of attrition.
If ACOC doesn't work and Oda doesn't emphasize the reason why King didn't want to do CQC with Zoro's ACOC before fleeing, then he really has created a no limit fallacy with the Lunarian durability.