The compelling narrative of a leader's biography is simply not sufficient data to justify general claims about leadership. Steve Jobs, for all his impact, was still only one person. In extracting general principles from his career as a whole, we have precisely one data point with which to work. And you can draw any line you want through a single data point. More importantly, the “question” that Walter Isaacson's biography really tackles is not, “What made Jobs great?” but, rather, “What made Jobs Jobs?”.