Hard to say. Jin definitely has that possible side to him, although you haven't seen it since season 1.
I really don't think so however. I think Claire just assumed he was because he was in her hidey hole.
I tend to agree. But if Unlocke was able to convince Jin that he was the key to being reunited with Sun I think all bets would be off.
And, yeah, Sawyer's whole character has always been about the con. No way he isn't at least trying to play Smokey.
