How? A Divergent Fanfic

WARNING CONTAINS ALLEGIANT SPOILERS. Everyone knows that will, Al, Marlene, Uriah, Tris and Jeanine died, but what if the hadn't? what if Tris missed will when she fired her gun? what if Al used a decoy for people to think he was dead? what if Uriah hadn't been near the explosion? What if Tris had survived the bullet...