So what do you think happened when Elliot awakes on the beach after the crash with Lisa alive ?

My first theory:
- Obviously when the magnetic field at the hatch exploded Elliot was on his way to the chart 325 and after the Sky lighted up he went back through time and POSSIBLY BECAUSE OF HIS POSITION close the magnetic field's limit he came back the day the plane crashed.
-SOMETHING changed in the past and why ? Because Elliot's own person wasn't the same as he learned to protect and be loyal to his people. Now Because of that He'd never betray Lisa for a Photo and that's why she's alive and this time she's on the plane with him.
-The plane crash and our happy couple is part of survivors of Flight 815 on the island.
-Maybe that's why we don't see them in the show as they keep it low without having any story worth telling as Elliot Via Domus's journey has never been taking place.

when i finished i thought that magnet thing was what crashed the plane in the first place, but you turn it off so how is it possible that the second plane crashed on the same spot?