It's Oda's usual subverting expectation shtick striking again. He first shows you how Saturn and Sommers regenerate from nothing or at least telenetically reattach their limbs to heal, but then later retcons the shit out of it and makes it that they actually need to manually reattach said limbs to heal, ie Sommers this chapter and Killingham last chapter. It's infuriating that's what it is.
In relation to CoC coating, all we know for now is that it causes extreme pain for the HK and halts their healing for a little while, and possibly kills them if it's too strong for them.
As for Sanji, he is almost guaranteed to unlock anytime now, but I personally don't think he used it against Killingham
In relation to CoC coating, all we know for now is that it causes extreme pain for the HK and halts their healing for a little while, and possibly kills them if it's too strong for them.
As for Sanji, he is almost guaranteed to unlock anytime now, but I personally don't think he used it against Killingham


