That is, if Haki can be used in accordance with Magma as effectively as with swordsmanship. We've been told already, that through Ryuo, the swordsman becomes one with the blade and can cut everything, even elements like fire and water are diced into bits by Zoro - Magma wouldn't be different, with CoC yet again massively boosting the cutting capability. So does Ryuo + CoC massively increase the magma's heat and corrosiveness? People keep repeating the same stuff over and over again without getting into the arguments.