The team of wild horses on the left are not without strength. They are obviously heading in the same direction, which is a good thing. The problem is that they have not been harnessed effectively so that, while they might be producing individually they are not really working as a team.
The horses on the right have been effectively harnessed. We might not even be able to identify the weakest member of the team but as a team their output is far greater than each of them would accomplish.
The moral is simple but the images do far better justice at higlighting that team dynamics are important. You might have an A* team but as long as they are not pulling the same direction they may actually perform much worse than a well-harnessed team of subpar players.
It's also instructive to consider that the idea of harnessing is really important. This can only be accomplished by someone who has both the visionary and technical prowess to bring the team together. They need to win the respect of all team members involved. As long as their leadership and authority is not established then they will constantly be undermined by team members who regard themselves as better candidates. This need not be a single individual but a cohesive subteam which executes the leadership and authority over the rest of the team so as to bring out the best in everyone.