Hurley was hullucinating about a man he called Dave. When Libby and Desmond met each other in the coffee shop, she said her husband was David. Libby and Hurley are at the same mental institution as him. Maybe Dave is David? If Libby comes to the mental institution before Hurley and then he starts seeing Dave when he comes, maybe Libby's presence at the insitution made him see Dave. David and Dave could be the same thing. But when I was re-watching the episode Dave, I noticed that Libby and Dave where oppisite from each other. Dave wants Hurley to eat lots and believe Dave, and Libby wants Hurley to let go of Dave. Any thoughts?