And yes, it could be a clue, but it's not a lot to go on. Lee would be a boring final Cylon for me, because he's one of the less interesting characters on the show. He's so blah, you don't like him or dislike him. The one thing going for him is we have almost never seen his internal mental dialog, so he has the best shot of being a character who knows he is a Cylon. We've seen inside Roslin's head, and Baltar's, and Starbuck's and a little bit inside Bill Adama's (mostly his ex-wife.) I like the idea that the final one is not a sleeper, but then I don't like the sleeper concept much, it's been done enough now.