It is not guaranteed that if a person is given management education and a designation, he will be able to manage.
Some people are good at working well independently. But, they can’t work in teams along with others.
Sachin Tendulkar may become a legendary player, but he may not become a good captain.
If we try to make every great player a captain of his team, then they may fail miserably.
Everybody can’t become a successful captain.
The same is true about being a manager.