Good thread
@TheKnightOfTheSea
But my assumption is Oda really teasing us about Sanji should accept his origin as a Vinsmoke to unlock his full potential/powerup, why?
1. Oda teases us with Sanji early design and early Stealth Black design. Sanji got black hair and in stealth black suit his hairtip is black haired.
This could also lead to reverse super saiyan theory.
2. This is so "shonen style" where you get an instant powerup because of some flashback or some situation.
This could happen when in Sanji's fight against King/Queen, both of them is about landing a killing blow to Sanji and then Sanji got a little flashback about Sora and she told Sanji that its okay to accept "Vinsmoke" name because she want Sanji to be stay alive to protect everyone that he cared for.
3. And when Sanji saves Momo, he said "What a way to say a name like a man" or something like that. If Oda doesnt make Sanji to shout his real name in front of many, why Oda makes Sanji said that to Momo.