Leadership is a quality, a distinction. It’s something you’re either good at or you’re not. There’s no exact recipe for being a leader. In business, for instance, it’s good for the CEO to have charisma. Because the CEO is often the face of the company. But you can do without a charming personality and still make a truckload of cash if you have your game on. Attractiveness is a plus, but certainly not a requirement.
In sales, it pays to be convincing. Some convince through body language, others with their tone of voice. Master none and you can still sell if you dot the “i” with strong arguments. In sales, it doesn’t matter how you get there, as long as you get there.