It could be possible that Jin would transport with the Island while the gang in the chopper would not, even though closer to the Island
The island disappeared in a whirlpool in the ocean. I think it sucked in it everything surrounding, the people in the water,
Daniel on the boat and the remains of the freighter. The helicopter was in the air.
Like when you pull the table-cover you bring down everything on it, but not the lamp hanging above the table.
I think Jin is alive.
I guess I was right... except for the remains of the freighter.
