The Leadership Development Magic Bullet

It seems that everyone is struggling with the challenge of developing leaders and in the process they're desperately looking for "what works".  So the questions abound:  What's the best curriculum, best delivery system or best tool for leadership development?  Despite the fact leadership development is getting more and more attention  few are making progress with this challenge.  So what's the magic bullet?While there is nothing wrong with those questions, we're still overlooking the core ingredient for leadership development.  The magic bullet is YOU.  You can develop a leader with lousy curriculum.  You can train someone without a fancy tool.  And the best delivery system will always be a leader passing on what he has learned to a potential leader.