From your earlier statements, the precursors are just watching things unfold, so they aren't legitimate in the fight over which universe would win. They are basically pacifists.
If there were to be halo rings existing in the Star Wars universe, it would be felt on both light and dark side. The light side would be forced to destroy the ring to preserve life and the dark side would seek the same objective to preserve the cause.
The precursors would watch it unfold and wouldn't care either way, so please stop basing you argument on these pacifists of "gods"
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See the argument is not to have the universes put together and see what happens but it is a all out war the point is to have all assets on all sides fight each other it's a battle of abilities and skills not of how they would act in their own universe. I doubt that in this situation the universes would fight, but instead try for peace. But since this is an all out war the ways the characters act is not important.