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My speculations about the episode:
As usual, the underlying questions the episode posed are about destiny versus free-will -- does everything happen because it is supposed to or does it happen because we make it? One brother represents destiny, one represents self-determination. One represents obedience, one represents defiance.
Prior to the fake-mother's interference (because she truly didn't believe in her heart that the right thing would happen without her intercession), neither Jacob nor the man in black were wholly good or bad. Both of them were hurting because she killed their real mother, but man in black was brave enough to strike out on his own. Jacob felt that the woman was all he had.
I believe that the golden light represents hope, and the island is the cork keeping hope in the box like Pandora's box. Evil had already been unleashed into the world, but if the island keeps "hope" then it keeps it alive in all of us. If it leaves, then hope inside all of us dies and we are lost.
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