Well I am courious of this very topic, do you think they could be related? I mean I hear talk that Jack wasent ALWAYS a Pirate ? have you heard this yet? there is talk on other boards Ive read that Jack wasent always a Pirate?? so I was wondering , what if they are somehow related becuse Beckett never said what kind of mark jack left on him?
According to wikipedia, Jack used to work for the EITC and when he refused to transport slaves, they branded him a pirate for his insubordination and he never looked back. I think the "mark" Beckett is refering to is more symbolic. Jack is his arch enemy. He left a mark on Beckett's soul. Of course, I could be wrong, but that's just what I think. Jack's the uncatchable enemy that haunts him.