The greatest organizations in history, whether they were political or business, were always lead by one supreme leader. Very few organizations succeed when they have more than one man leading it. As Napoleon Bonaparte said, “one bad general is better than two good ones.” In some of the greatest military battles in history, such as the Battle of Cannae in which Hannibal fought the two Roman generals Gaius Terentius Varro and Lucious Aemillius Paullus. Hannibal, who led his own army and didn't have to share leadership with others, destroyed the Romans.
Centuries later, the great French general Napoleon would likewise win many of the battles in which he was up against multiple European states. The point is that the organization which is controlled and guided by a single powerful individual has much more flexibility and speed when compared to an organization that doesn't. Often, when you are up against a competitor who has formed an alliance with others inside their organization, they will often seem formidable. But you should never allow this to intimidate your. Organizations with divided leadership are the best organizations to fight.
These organizations tend to implode simply because the divided leadership often bickers and fights with one another. The problem with sharing your leadership with others is that there will ultimately be disputes as to who has control over the organization. The best way to avoid these disputes is to make sure you're the center of gravity. Never share your leadership with any one.