I already showed you his leg is black under IJ. It’s probably black under DJ too. Not that oda cares about the difference beyond aesthetic
Again, you are bringing Sanji vs Queen and I have clearly said multiple times that Oda intended to go with tech path until he made Sanji ditch RS which happened before IJ.
Differences were clearly there before that.
Luffy and Zoro got training twice - Sanji didn't.
Luffy and Zoro were clearly showing visible application of haki more often than Sanji. Infact in case of Sanji with exception of CoO and invisible CoA (which one can deduce because of ability to hit logia) , we didn't get much at all.
Both got Advanced haki while Sanji didn't even get advanced CoO.
What Sanji did get clearly was RS which he put up few times and even used it in combat once. (All 3 times in early stages of an arc) Then oda made him ditch it and we got IJ.