What about the possibility that the parrallel reality scenario is at work here, and that the same sh-- is going on somewhere else, but with a different group of survivors. Every now and then, the realities brush against each other, like in the radio transmissions.
Locke was paralyzed at the box company...remember, he was talking about his vacation while he was there and we never saw him standing. It wasn't until he was actually in Australia at the tour operators office that we actually found out that he had been in a wheelchair.