Power Mochi and especially Zangiri Mochi should do damage. Against Tatsumaki, King was guarding himself and other than that you cannot say that Katskuri's attacks will not harm King, just because some of Zoro's cuts so far didn't come through. It should be noted that King is dodging too, even casual attacks, which means they are doing some sort of harm.
Plus, there seems to be a "secret" to harming King more effectively which is not just having higher attack power.
And where King has durability, Katakuri has excellent evasion.
Plus, there seems to be a "secret" to harming King more effectively which is not just having higher attack power.
And where King has durability, Katakuri has excellent evasion.