Someone probably already had this theory, but I'll make this post anyway. After the God Valley incident was revealed, we learned things like: Blackbeard being Xebec's son, and also that both are from the Davy family (they are direct relatives of Davy Jones, who most likely belonged to the Void Century). You probably already know the theory that Blackbeard has the souls of three people, and that's why he can eat more than one Devil Fruit, but what if those three souls are Teach, Xebec, and Davy Jones? It makes a lot of sense in my opinion, which is why Xebec spoke with such certainty that he and Imu would see each other again. I'd like to know someone's opinion, and please forgive me if I've made any spelling mistakes (I'm Brazilian and I'm using Google Translate to write this text).