What you’ve just said doesn’t really contradict what I’m saying above. The drug Sora took could have potentially added an x factor to the blue print Judge was trying to create which enabled Sanji to awaken genes from the master race. Or the Drug itself could have been a relic the Vibsmokes 300 years go left behingd. Sanji stumbling on that ultimate gene either by coincidence or due to that relic again won’t contradict anything I’ve said above.
Also I think you’re misunderstanding something here, I’m not saying the vinsmokes were once that master race but rather they stumbled on it 300 years ago as a result of their lineage factor research & got erased as a result.
I know what I said doesn't refute your idea, I'm just saying we should keep things simple imo, this is why I talked about applying Occam's razor. I feel like you're kinda complicating everything for the sake of your theory. You took your idea as a starting point and you're trying to make the shoe fit.
How did Sora find a 300-year-old drug that happened to belong to the Vinsmoke line without Judge's knowledge? Why didn't Judge recognize this power in Sanji when he saw him use DJ? Seems like a stretch to me. I guess you could find an explanation even for those things, but it'd just be speculation based on speculation. You'd have to further complicate things and come up with something Oda is very unlikely to have thought about. With that approach, we pretty much can make a million different theories that'd be irrefutable.
Those are the simple facts we're aware of:
Sanji is a "normal" human that was unaffected by Judge's enhancements (until he used the RS, obviously) and his genes stayed dormant
Sanji is the only human who has abnormal heat resistance and can use flames without a DF or haki
Sanji is the only one who was affected by the drug his mother ingested, resulting in his genes staying dormant
So my conclusion is that the drug is likely the cause of Sanji's unique abilities and although I understand you're not disputing that, I prefer to leave it at that.
Adding Vinsmoke lore on top of this seems kinda random and unnecessary to me. I'm not saying we can't have more Vinsmoke lore, as there are clearly grey areas that leave room for more development here, but there's no reason to believe it'd have anything to do with the drug Sora took or Sanji's abilities. Imo we shouldn't take everything we can tie to Sanji and his family and just mix everything together in a bowl.