I went over on this page:
Mythbusters/Speculations | One Piece Wiki | Fandom
One myth mentions that Blackbeard ate the Cerberus fruit; however, this theory was already proven wrong when the Shamrock sword "ate" that fruit.
So I think it need to be meantioned there.
And I have a question about the first chapter (Luffy flashback):
I remember that I heard something that the reason that Shanks lost his hand in the first chapter was something that the editor of One Piece at the time suggested. Is there any source for that?