All competitors are not created equal, so compensating for the weaknesses of the members is one of the factors in team competition training. One person may be the one necessary to make up time during the last leg of the race, or they may be the best person to give a healthy head start to the entire team. Choosing a person for their endurance could be the way to go in a longer leg, and looking for the best springer might pay handsomely on shorter legs.
Some team events are not broken up into individual legs, and the entire team may be competing together. Each one will have their own strengths to bring. Counting on a team member to pass with accuracy could be important. The person able to get the ball into the goal or basket is another strength that should be recognized and practiced on a regular basis.
Each position in a team sport generally requires special skills of the player. When it is time to make points, the person best suited is often on the field. Most sports competitions allow for additional team members to sit on the bench as replacements. Learning a different or new specialty is more likely to give those players an opportunity to be in the actual competition. When the person best at scoring the goal or basket needs a break, the replacement is likely to be someone able to do almost as well at that part of the game.
There are many factors to competing as a team, and one is that players must learn to depend upon each other. There is no single person any more important, and each competitor must rely on team members to do their job correctly. While they may be talented as a group, each one will be responsible for training to ensure they contribute their fair share towards winning.