It's because that shot was an homage to DaVinci's The Last Supper. Twelve disciples--twelve people in the shot plus Marritza. Very clever.
But I don't know what the lady who walks up and starts a conversation is supposed to represent.
Presumably the group of people who say "There's a crowd of people here. Ooh! Dead body! Can I poke it with a stick or would that break the mood?"