They are bringing alot of supernatural into this, I think. Almost making it seem jacob is a god. It seems almost BSG like. Like, here is my theory. What if if in the far future, the world ends. Jacob goes super far into the past (thus making him immortal). He is trying to change the future. "anything that is not the end is progress". Jacob is reliving a time loop over and over trying to prevent the end of the world, shaping events each time. When the end comes he can't die, because he has traveled so far back in time. So he comes back to try different stuff. Maybe the other guy is his brother or something and he is sick of it all.
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