It was war, Ascaleplus, as you know. In  that encounter, a soldier was killed, another was airlifted before the grenade was thrown. Testimony cast doubt that Khadr could have thrown the grenade, since he was severely wounded and partially blinded.
n what world do soldiers in combat roles get to sue the people they were attacking? When has that ever happened?
The widow will, I am sure, get a pension from her government. The  partially blinded soldier was discharged and probably gets a pension as well. War is hell, for everyone concerned.