Cowards do not count in battle; they are there, but not in it.

Being present and being involved are different states, and only one of them shows up in the result. A person can be on the team, in the room, among those counted, and contribute nothing to what happened. Usually this is fear rather than laziness, the sense that stepping forward is how you get hurt. The trouble is that the cost of holding back is paid by whoever did step forward.

Look at what you are nominally part of and ask what would be missing if you were not. If the honest answer is nothing, take one piece of it on properly, so that presence and contribution become the same fact.