Loop Prison by Yosi

So far most of us agree that Locke, who came back from dead, turned out to be MR. X that we saw at the beginning of the final episode of season 5. And we also know that, at the end of season 5, Jacob said he managed to find a `Loophole`. So my theory is that, Jacob had imprisoned Mr. X in some kind of time loop or event loop, and Mr. X wanted to break away from it.
Here is the exciting part. According to me, the first Loop that Mr. X was imprisoned may be the compass loop, you remember the compass is continuously given from Richard to Locke, then Lock to Richard, and then again from Richard to Locke. Somehow Mr. X manipulated the Loop and got out of it. NOW, what Jacob wants to do is, naturally, lock him up in another loop. That`s where Charlie`s Guitar, which he gave to Hurley, comes to help. As you all remember Charlie had lost his Guitar first time they crashed to the island. And after explosion, Hurley will somehow bring it back to Charlie, say it a reset or another time travel, does not matter. So here is your new Loop Prison, the Journey of Charlie`s Guitar back and forth.