Fact of the matter is this whole Lunarian power shit was with 99% certainty some last minute bullshit Oda came up with. We just have to ignore Marco knee/Zoro Onigiri early on. Oda retconned it. Luffy comparing them to Kaido is really hype for their durability. But again, the durability is "conditional".
There is something with all the right hands having some defensive capabilities
Marco - Seemingly endless endurance
King - Seemingly impenetrable durability
Katakuri - Seemingly untouchable
But they all have caveats.