Up to chapter 1004, it's all official colors
No such thing.
In germany the MC is officially R-uffy with his mate Lorenor Zorro.
As long as they do not fuck up too badly Oda is not interfering.
CoC is a requirement to control Enma.
KoH was only possible after Zoro learned to control Enma.
Zoro uses CoC, the beast pirates get knocked out, the lightening appears around his swords.
I really have no idea how Oda could make it any clearer.
You do not even have to read Zoros thoughts or Kings words in the panels to understand what is happening.