New theory on TV show LOST involving Locke?

I have come up with 2 new theories.Theory 1: Locke has been on the island before and is reliving everything again (This may be the same with Walt and/or Charlie). Theory 2: When the Swan exploded, Locke experienced the same time travel that Desmond did. Many things for evidence of this. From Locke being the only one to know where Charlie's guitar was and that he was a drug addict in season 1, to him telling Jack that he does believe in fate, he just don't know it YET in season 2 and Locke telling Jack "you're not supposed to do this" in season 3. Locke has seen everything before, he knows what's going to happen next. In the season 4 trailer, you can see him telling the group "if you wanna survive, you need to come with me". With Walt, he seems to show up at the right time when he is not present (season 3 finale),he is time traveling like Desmond did. Bea asked Michael if Walt ever showed up somewhere he shouldn't. Charlie knew the Beach Boys code pretty easily, a MUSICIAN programmed i