So we dont know if Sanji exoskeleton is fully awakened or not.
And not to mention if he will have CoC in the future.
Full exoskeleton awakening + CoC + Diable/Ifrit Jambe = Surtr Jambe
What i have been sayin for a while is: Sanji wont be able to stop his mind from being taken over if he doesn't show Conqueror's
Oda in SBS 103 said: "I felt relieved when i saw that Sanji's wasn't taken over by Germa" (Oda talking about his scene with Chuji and Sanji's "invisibility" power). Oda is relieved about something he should know already? Since then i knew he would bring this back again..
Oda's only possible response to that was making Sanji ask Zoro to kill him, seems pretty damn drastic doesn't it?
Until Sanji woke up fine, including his eyebrows, that came back to normal.
Now Oda brings it up again, leaves the question unanswered and tells us to "look over Sanji in the future". He basically only told us that Sanji already had a fire resistance prior to his Awakening...
It's Judge's will (Germa genes and the Stealth Black persona) VS Sanji's will (led by Zeff, Sora, the Strawhats and obviously the All Blue dream)
Although something similar could still happen without CoC being relevant to it, i just can't tell how exactly. Because CoC is Haki anyway, it is a power... What else could stop Sanji's transformation in such a critical moment that even Sanji's immediate response is asking someone to straight up kill him without hesitation? And why did the transformation stopped to begin with?
Rayleigh and Hyogoro made clear that Haki blooms in extreme conditions, and i think Oda is just waiting to address more of everything valuable for Sanji's character, including putting Sanji in a situation where he has to prove his ambition to find the All Blue, that would be a must.
Although i can see other 3 ways for Oda to deal with this that isn't about Haki awakening:
-Vegapunk could help Sanji out somehow, but this could go through many different ways to be honest
-Oda could simply create something else for Sanji to get rid of his genes, thus eliminating the chances of getting his mind take over by the "Stealth Black".
-Sanji literally chooses to die. It's drastic, but Sanji already accepted this possibility. Oda obviously wouldn't do it though so this one is the least probable for sure..