Looks like Danny Pickett (that broken nose look), but there's no way it's him (PLEASE...) It also kinda looks like Christian. One commenter suggested it's Horace, the guy who recruits Ben's father to the island and is the only person whose eyes Ben bothers to close when he slaughters the Dharma Initiative. Or maybe it's someone we haven't yet seen.
There's so much to think about in this episode, most obviously: Is Ben crazy, or is he really a conduit who can hear Jacob? Is he a prophet of some kind? I'll post my most recent response to the comments on the board here, because I really want to keep this discussion going. This episode was such a WHA?? moment in Lost, that it NEEDS to be discussed:
What's most interesting to me about Locke's reaction in the room is that the science vs. faith argument lasted throughout season 2. Locke was the faith, who believed in something even if he couldn't see it. Jack needed scientific proof. Now, Locke refuses to believe that there's someone in the chair. What about all the Old Testament prophets who spoke directly to God? The people didn't think they were nutters, and believed that God really did have a conduit on Earth. Yet Locke refuses to believe that Ben, of all people, could be that conduit. Maybe Locke really is very religious and sees Ben as an unworthy prophet.
It makes us see the Ben/Locke situation in an entirely new light. Looking at it from a "Ben is jealous of Locke" point of view, suddenly everything takes on new meaning. That Ben destroyed the last of Locke's faith at the end of season 2 by making him believe in Ben completely and then betraying that trust. That Ben told him to kill his father, as if he needed to bring Locke down to his level.
However, this ALSO sheds a question on Richard. Last week I asked if Richard was acting on his own when he gave Locke that file, or if he was working for Ben. I think it was Brian who posted and said there's NO question he was working for Ben (and I agreed at the time). But now I'm not so sure. Maybe everyone now sees Locke as the true Messiah and sees Ben as a charlatan. Notice no one helped when Locke was beating the bejesus out of Mikhail. If Ben needed Locke to kill Cooper to destroy his soul, it was Richard who offered him the way out.
Ben's position within the community has been threatened by Locke, and he needs to get rid of him.