There is an old saying, you are only as strong as your weakest link.
It has become so popular that they even made a TV show from the name. I never watched it but if my memory is correct it was quite popular. No clue if it is still running.
It can be difficult in any organization to make sure that everyone is pulling their weight and contributing to the greater good on a regular basis. That is why we have organizational structures that start with the president and go down. Vice Presidents, managers, middle managers, and so on usually make up some sort of structure.