Many would say that low self-esteem is bad, but there are situations were low self-esteem is powerful. It is when it is coupled with another invaluable attribute - Drive.
To lead is to see the shape of people — and the empty space in problems, then fit the people to that space and let them grow. If the problem space is to large, the stretch to far, you have failed them. If the problem space is to small, the fit too tight, you have failed them