We're going to get a clear indication when he does. I expect some changes in the way it's drawn to highlight it, and the names of the techniques should change as it does with Luffy. Like Luffy's G3 Giant Pistol is a Elephant Gun when used with Hardening.
100 percent agreed. However the reason why I made the statement is because we don't see luffys hardened hand when inflamed with red hawks flames. Just thought the same applied to sanji. And then added with the fact that sanji were black shoes ontop of using diable jambe. We wouldn't even know if he was using hardening or not in conjuction with diable jambe. But again you may be right
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Random note don't know if anyone else said this but I think we are misinterpreting what was said about who's who punishment and luffys devil fruit clue. Now that I am reading it (the spoilers). I think the clue with luffy is luffy doing something with a fruit he was not supposed to do. That clue could be why who's who was arrested. Because he ate a fruit he wasn't given permission to eat the same way luffy ate a fruit he wasn't supposed to eat