Hmmm...In other words, is he or isn't he a time traveler?

You know, the first time he shows up in the stadium with Jack, it seems obvious that Des knows who Jack is. So I guess that when he first had to turn the failsafe key, he may have become a time traveler then. But how would he have known about Jack at that point?

You know, Des could indeed be one of the time travelers; the only unanswerable question is, what's his motivation? When talking to Mrs. Hawking, he seems totally at a loss. Has he been taking the same time journey over and over to try to figure out a way to get back to Penny without destroying the world?

These are just some ideas percolating up...please let me know what you think!