Hmmmm....

riiiiight.

So you're saying they brought the building materials and the oven and kitchen sets in thier village from the future. Doesnt make sense. lots of the things they have look vintage or late 80's even... but more importantly, they are by no means super advanced in terms of thier way of being, like you would expect from a utopian pristine person from the future. If anything i think they could be more like the new austrailia for freaks... left there long ago

One other good thing to think about is that they would probably have killed Jack first thing. much like scientologists to a therapist, they would probably think that of Jack. His "Old way of thinking" doctor skills would be of no use to them, perhaps even offensive to them...

The one thing that i think could turn the scales in your favor is the second island. Maybe they are the same island but one is ahead of the other in TIME. nd thats why you can't see it from the original island... dun dun duuuuuuh!