I remember some years ago, talking with a couple of experienced co-workers about a young and frustrated manager we worked with. He was very talented, but also hotheaded. Someone suggested that what he needed was a good death march... without the experience of being expected to do something actually impossible, he just didn't know why we would all drag our feet on things so much.

He's since had a failed startup, which I hope tempered him some. So very talented, but not sufficiently scared.