One Piece Theory-Blackbeard Is Three People In One Body(spoilers)

During the Marineford Arc, Blackbeard turned the world on its head by using two different Devil Fruit powers. A feat that was supposed to be impossible. One popular fan theory suggests that Blackbeard pulled this off because he has a condition known as "fetus in fetu" and that he has two siblings inside him.Evidence supporting this theory include how Luffy and Zoro mention during the Jaya arc that Blackbeard is possibly "more than one" guy. During the Marineford arc, Marco also mentions that Blackbeard's body is unique. Finally, his Jolly Roger has three skulls. A design that is similar to a two-headed Jolly Roger belonging to the pirate twins the Decalvan Brothers. All this points to Blackbeard being a genetic chimera. Info from https://screenrant.com/one-piece-fan-theories-we-hope-are-true/