Why is everyone acting like the diable jambe is a genetic modification of the Judge?
Judge wanted Sanji to have the power of invisibility, the stealth black, fire abilities have nothing to do with the mutant transformation Judge wanted for Sanji.
Sora is related to the heavens, the race in Sanji's DNA is probably related to Sora in some way, maybe she's a Tengu, or it has to do with the drugs Vegapunk offered her.
The Sanji's power aligned with Sora's sacrifice makes a lot more sense than the Nazi germa science, to be sure.
By the way, I can't wait for Sanji's demonic transformation, awakening the mutated genes of the King race, being able to amplify firepower (like Hell Memories) and possibly having black wings to give him more speed, it would completely overshadow the powers of the RS.
Let's wait and see.