Out of all the theories you listed there, Vegapunk's relation with Sora and Diable Jambe's origin is what I'm looking forward the most. I did have my own theory of where DJ originates so maybe I will post a thread about it someday. Only problem is that if the theory of Vegapunk being related to Sora is true then there goes my theory of Sora being a Celestial Dragon.
And that's why I'm here cuz most, if not, all my predictions about Sanji came true.:cheers:
It's like Oda and I are the same person.