It's a nice way to connect modern Final Fantasy to its 8-bit roots, but also a refreshing angle for a series where you usually play as the world-saving hero. I'm into the idea of Stranger of Paradise being a villain origin story for Garland.
That goes some way to explaining the Origin in the title. The precise details of the plot are still unknown, but it seems Stranger of Paradise is the tale of how Jack becomes the Garland we met back in 1987, and ultimately Chaos. But here's where things get interesting: Jack's full name is Jack Garland. The new warriors, led by a man named Jack, are people from another world who have been transported here against their will.