I'm surprised that no one else has mentioned this, (and if they have forgive me) but didn't it look like Michael was getting sick with something? At one point the five of them were in the jungle (Michael, Jack, Sawyer, Kate, and Hurley) and Michael was looking at his hand and there was definately a silvery sort of lesion forming on it. He also said that he wasn't feeling well when Jack asked what was wrong. Then, when Fenry handed over Walt on the dock it looked like a lesion was forming on his head. (Does anyone have a screen cap of any of this?) I think that the mystery sickness is starting to form in Michael and I'm guessing that it was given to him by the Others when he was in captivity. If so it means that we probably haven't seen the last of Michael and Walt. Any thoughts?