Smart, creative, flexible people tend to have fast-paced careers. Some may soon want to move on. That’s OK with superbosses. They understand that the quality of talent on their teams matters more than stability, and they regard turnover as an opportunity to find fresh stars. Consider how Discovery Communications founder John Hendricks reacted when, in 1997, his second in command, Richard Allen, was asked to become the head of National Geographic’s for-profit arm. Hendricks would have loved to have kept Allen but never tried to hold him back, realizing that he’d rather have a friend leading his rival than anyone else. “It was a real indication of his generosity of spirit,” Allen says.