one person

There's an old saying which says "a team is only as strong as their weakest link."

However, if the team loses a game or competition, in most cases their loss can't be blamed solely on whomever that unlucky individual is.

As it's the team's job to work together and lift up their struggling teammates.

In other cases, however, one individual can be blamed for the misfortune or bad luck of one or more people.

As it was their poor judgment or bad decisions that put them and everyone else in the unfair, unfortunate situations they now find themselves in.