You could try leaving ARC there. I’ve heard that paper ARC is a thing. You keep ARC low gear and he’ll die off almost immediately to the AOEs from the opponent’s Echo or GAS. Then Five sacrifices himself right away. Everyone is at full or close to full health and protection, so you get the maximum benefit of Fives. Supposedly, it’s not easy to fight on mirror matches because it’s so easy to kill off ARC. My ARC was already G13 by the time I heard about it.