Individual differences can make one worker better than another and they can make teamwork easier or more difficult.  It all depends on the individuals and the way work together.

Some employees are simply more motivated and more organized than others.  These employees' performances tend to be enhanced by their characteristics.  Some employees have personalities that mesh well together while others do not.  When employees have personalities that do not mesh, it will detract from their performance if they are put together on a team.

People who hire and manage employees must be aware of the characteristics of the people they interact with so they can hire the best employees and put them together in the best teams.