more Lost ?s

maybe you can answer some:

• how come libby had this strange look when hurley said 'that'll give me a chance to remember where I know you from'? I think she's still alive...
• why did michael look distraught after he shot libby and ana lucia? And then all of a sudden looked in control when he opened up Henry's cell and then shot himself? You think his mind was being controlled at certain times?
• why didn't kate bring up the others' costumes she found at the medical hatch, when michael was describing the tents and teepes and hwo the others wear tattered clothing?
• who was that girl down under that Jack's dad visited? Jack's long lost half sister? Could it have been claire????

It just gets more interesting from here on....