Aren't there supposed to be six instead of five soliders?

There are five people who voluntarily injure themselves (Angel Bassignano and the other guy with him, Benoît Notre-Dame, Manech, Six-Soux) and another one who accidentally injures himself (Bastoche) while trying to get rid of some rats.

At first, I thought that the other guy with Angel Bassignano had died since it seemed like he had been shot in the face but then on second viewing, it emerged that the bullet had just grazed him and that he was still moving after being shot.

So, my question is why do they only show five people being court-martialed and sent over to die?