Darkness [Spoiler Warning]

[Adire]

Final Fantasy is a series where the story is on rails and you're never given a choice to switch sides. On a more practical level, Square would cry trying to cram content for two "factions" and they'd probably watered down.

We can still dream that they'll maybe broaden their horizon one day

In a game where such a large amount of dialogue is text based, it especially seems like a reasonable dream.