My theory for Sun, Locke, Ben, and the rest of the 316 crew not being in 1977 with the rest of the 815ers is because of Aaron. Didn't everyone saw the ALL OF YOU had to go back (meaning all of the people that left the island). I'm pretty sure Aaron left the island too, and he was one of the Oceanic 6. Who ever made an exception for Aaron NOT to be on the plane???? Ms. Hawking also said that anything could happen if they all couldn't get back to the island. So my theory is that because Aaron wasn't on that plane with the rest of them, not everyone could be flashed back to 1977, which is why Sun, Locke, Ben, and everyone is still stuck in 2007. What does everyone think about this theory?