The phrase "only leader" is an idiomatic expression that means someone who stands out as a natural and skilled leader among their peers. This person has qualities such as confidence, charisma, and strong communication skills which make them effective in guiding others towards achieving common goals. They are not afraid to take charge or make difficult decisions when necessary, and they inspire trust and respect from those around them. In short, an "only leader" is someone who possesses the unique ability to lead and motivate others effectively.