If you’ve ever used a chain to pull something you know that chain is only as strong as its weakest link. Which means it’s important to have all the links be complete and not rusty or weak. It’s the same way in a team, all the team members need to be be complete, fully engaged and involved, because if you’re the weak link in the team, you’ll drag the rest down to your level of incompleteness. The other aspect of that is when you find yourself the strongest member of a team, you can either help others grow, or find yourself a new team.