I never thought arron was one of the six, unborn fetuses simply dont count as crash survivors, I never heard a report of a plane crash with 230 dead and 1 unborn child, they may comment on one being pregnant but that doesnt make the body count 231, now the fact that he is in the future (are we sure of this?) then we know he gets off the island but I dont think anyone would count him as one of the survivors since he was born post crash.