The first two explain the leadership development for a small number of people. Some personality traits may lead people naturally into leadership roles. A crisis or important event may cause an individual to rise to the occasion which brings out extraordinary leadership qualities in an ordinary person. The third explanation is most widely accepted today. People can choose to become leaders.
People can learn leadership skills.
There is nothing mysterious about being a leader. Leadership is a learned behavior. Everyone can improve leadership skills through practice. Every person within a group can provide some type of leadership. Everyone has different personality traits and skills.