Revelations from SHADOWBRINGERS

[EdwinLi]

That's not rejoining, that's overwriting timelines - only one version survives and the other is "thrown out". And you're only thinking about the Source, not the shards - we've seen that the worlds aren't identical copies like that. The differences are far greater than "character X died on the Source but survived on the First" - entire civilisations are different.

Additionally, replacing the Source with "a version of the Source where the Ascians never existed" is near impossible. They didn't just cause the death of a few people we like; they're entwined through all of history. The Allagan Empire might not exist; the Garlean Empire would not exist; the War of the Magi well might have been their doing. The Sundering itself might be erased.

This is an entirely different issue to the Rejoining ofthe current worlds, to say the least.

It is still a possible "Rejoining" result as it has been used before in certain stories when they fused together Two or multiple Parallel worlds.

The other option is a bit complicated because they have to take into considerations what the Rejoining actually means if it is done through a Non-Calamity method. That one can result in a completely new and Larger world that combines all the lands of all remaining Shards that was not destroyed by their select element and forced back into the Source thus becoming new "Continents" for future expansions to explore in a Ascian/Zodiark free world.

It is difficult now to determine the result of a Non-Calamity rejoining because we only know about what happens when a Rejoining happens in a Calamity method which would basically destroy all life in the shard so it can become the elemental energy needed to return to the source. However, a Non-Calamity rejoining may not bring the destruction of the Shard lands but instead may preserve it and add it into the world.