Sanji's fire powers are most likely totally related to Sora
Just the fact that Sora died because of him, his relation with his mother, and the fact that Sanji's emotions (anger specifically) plays a big role on Sanji's fire powers makes pretty clear what Oda is setting up for him.
Queen is similar to Germa in his ideals.
I can see Sanji's battle being all about Sanji being the opposite of what Queen and Judge are.
Even in a scenario that Sanji makes use of human modifications/tools to get stronger (like awakening his Lineage Factor), his victory will come because of him being a completely different person from who they are, chapter 1023 focused a lot on Sanji's abilities to produce fire, and his passion that "makes it burn even more hotter than fire/flames", and how Queen, a scientist member of MADS, sees his powers
Sanji having his emotions is what makes him stronger and better than his family. From Zeff's influence on who he is, and in almost all he learned, to cooking and fighting skills.
Diable Jambe MUST be the "legacy" of Sora's sacrifice to Sanji. Despite if the source of it comes from Judge's influence or not (which i doubt, because Sanji should be the mindless Stealth Black according to Judge, not producing fire), or King's race connection to Sora, the fact that Sanji can go further and get stronger (not just with Diable Jambe, but with overall training) is due to the fact that he has his emotions, and he isn't a mindless soldier that WAS CREATED SOLELY TO OBEY Judge, like all of Sanji's siblings do (except Reiju, who has emotions, but is modified and can't disobey Judge for the most part) and thats thanks to Sora's drugs.
The Raid Suit is bringing something out of Sanji, he said he is feeling weird! Is there a conflict between Sora's drugs and his Lineage Factor? Or it is just the Raid Suit boosting whatever Diable Jambe is?
Oda is most likely making Sora's sacrifice more relevant than it seems, even having a major role on Sanji's current and future power ups. I hope atleast.
Thats the main reasons of why Judge considers Sanji a failure afterall