He may just hire the best team but if the leader believes that to be the end of his task, he is in for a rude shock. Even the best teams can give best results only when an effective leader synchronizes the collective performance. That is his role.
Magic is not in the assemblage. It is in the leader's ability to synchronize. Check deep. If you are a cricket fan you will know the secret why MS Dhoni is considered the best ever Captain in all formats. Whilst better individual performers in his batting and wicket-keeping skills exist but not any in their ability to synchronize team performance.
Also Saurav Ganguly for the same reasons... building passion and synchronization of team performance. So important it is for leadership.