I think it's possible to atttach a kill counter to each bot to count his victims like aces in war.
(got idea when looking at the picture with the 3 osiris)
If the bot is killed the counter is cleared.
If the counter reaches defined thresholds the player could have rewards
(fuel or other ressources).
There could be a board to rank the virtuose killers.
If the squad level of killer is higher than the opponent, his counters will remain unchanged and same for victims.
Maybe this could incite players to keep their bots alive during fight and progress in kill board.