Hhhhhh
It’s just headcanon... but Sanji has panels that elludes to coating his attacks with King’s haki... cause as far as my understanding of Haki types...
1- Armament haki is ONLY drawn on your fist or around your fist if your level is high in Ryuu
2- King’s haki are the only ones used with unique drawing of haki sparkles coming out of the clash like black getsuga tenshu lightening...
IT would be surprising but “genius set up” by Oda if when:
- Sanji smacked Oven and saved Chiffon.. “he coated himself in king’s haki... NOT armament haki”
- Same when he hit Pageone in some panels...
It would be genius by Oda because it follows his drawing pattern... and maybe Sanji never really needed “black coating of armament haki on his leg” because he was relying on King’s haki instead...
Again... it’s NOT likely... but when you stated the CoC... I had the urge to troll you by giving you this theory of mine hhhhh