LOCKE: Backgammon is the oldest game in the world. Archeologists found sets when they excavated the ruins of ancient Mesopotamia. Five thousand years old. That's older than Jesus Christ.
WALT: Did they have dice and stuff?
LOCKE: [nods] Mhhm. But theirs weren't made of plastic. Their dice were made of bones.
LOCKE: Two players. Two sides. One is light … one is dark. Walt, do you want to know a secret?
It's interesting to me that S1 Locke was more like Fake Locke than the Locke we've seen before the island, or in his later days on the island. Was he always under Bad Guy's spell? Even though Jacob touched him/resurrected him?
How long have Jacob and Bad Guy been around? Since Egyptian times? Longer? Are they Jacob and Esau like some people speculate at The Fuselage?
Remember how Walt told Locke he'd seen him in a vision with people wanting to hurt him? Did we see that yet? Or is that coming up in S6? So did Walt then see Fake Locke in his vision?
How ironic is it that it now seems that Ben was one of the "good guys"? He was working for Jacob all that time. He was carrying out his will. He had faith in Jacob. Only to be tricked by the Fake Locke into killing Jacob at the end. Except, maybe, Jacob knew that would happen? Was the "What about you?" moment a Judas-moment? Jacob knew Ben would kill him and that was why he had asked Ilana to help him. Something more is going on here than "just" Ben and Locke being used as dupes by Jacob's nemesis.