Having said all of that, let me rephrase the question. ”What can a sales manager do to improve the likelihood that he/she will shape the development of a superstar?”  That question I can answer:
1. Hire motivated people who have a drive to excel. Look for a record of success in two or more endeavors and evidence of a self-image of being a highly successful
person.
2. Surround them with images of success and models of achievement.
3. Coach intensively at first, and gradually move to intervention only when it’s necessary. In your coaching, speak three words of positive reinforcement for every word of criticism. Support and encourage the positive behaviors, and ignore as much as you can the negatives.
4. Expect excellence, and recognize them frequently and publicly for attaining it.
5. Invest in their development. Spend money sending them to seminars, buying them books and audio programs.
6. Keep in regular communication, and create a climate where your budding superstar can talk with you about what is on his/her mind.
If you do these things, your chances of developing a superstar will increase enormously.