Fight Takes Place on Oa, on which every single Green Lantern in the universe is distributed evenly across the planet at the start of the fight. The exception is Mogo, who is orbiting close by.
Superman, Flash, and Cyborg have morals off, are bloodlusted, and have perfect team work.
No one is bonded to Ion. The Lanterns only have Green Lantern abilities.
No prep for either side.