Why only boss medals for 3-4 player max, and not the entire team?
I could assume a reason would be how medals increase your bar for req levels, which would make the team that gets the kill not only higher in points but it can make the whole team stronger making it even harder for the other team to make a comeback, if they are losing.
Because if someone in the team is sitting around at the main base or doing any other thing apart from shooting at the boss, they do not deserve to be given credit for the kill.
or just player on team who hit boss