No offense, but... The theory about Serge being Lavos makes no sense to me...
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Since Dalton put wings to the Epoch, i believe that it is a machine like any other and not a magical device. It looks like a machine too.
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The theory already posted that Belthasar could not find necessary resources to do the Epoch don't convinces me. In Original Timeline, Lavos destructed the world, but Belthasar managed to find "parts" to the Epoch even in that bleak era. So, since Belthasar is such a genius (more even than Einstein), i believe that lack of materials was never a drawback to him...
It is indeed a theory that works, we only do not know if it's true... but as i said, i believe it's not...
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For now, i believe that the theory of the Dead Sea Article makes more sense... Since Serge split the timeline into two dimensions, the actions of Crono were all nulled in Home... Crono did those things only in Another... actions that did not got carried to the new dimension (Home) when it was made... Then, that bad future is the same as the future of the Original Timeline.
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EDIT:
Radox Redux, i believe your theory is very good...
1. The Sea of Eden would have to change to become the Dead Sea as soon as Serge touches the Frozen Flame. However it was in that instance that Wazuki becomes corrupted, so it's not beyond possibility that his orders to kill Serge were obtained in that instance.
I think this has an explanation... When Serge touched the Flame, he became its arbiter... Some years later, Wazuki kills Serge, then FATE regained control of the Records of Fate and of the minds of the El Nidians, preventing more aggression to the history and preserving the good future. What i mean is, the records of fate stayed deactivated for less time than it was needed to the El Nindians to influenece history deeply... In Home, FATE never regain control of itself, since Serge survives, then it never regained control of the minds of the El Nidians... hundreds of years then would have passed without El Nidians being manipulated, what would cause a huge distortion of the happennings in the world and somehow preventing Crono from fulfilling its purposes...
What do you think?
Time Traveler statement also makes sense... Home and Another have their own timelines, their own pasts...