As i am thinking after seeing raws
1.zoro is defenitely using coc
2.zoro is giving coc to all three of his swords
3.zoro is not coating them with coc instead he is giving his swords coc instead of ryuo
At this point I am not surprised to see Jinbe (who mysteriously gone missing for weeks already) to show up and help Sanji fighting Queen.
Just like the good old days in Fishman Island..
I meant unlike post TS Zoro, which is totally new thing that he can't hurt his opponents..
For post TS Sanji it is not new thing at all, it becomes a tradition every single arc. From Punk Hazard door to Vergo's leg to Doffy's coat to Page One etc..