Yay, you and she have different definitions of “leader”.† So what?

† You’re talking about people in charge of organizations, whereas she is talking about people who come up with new ideas, new inventions. These are very different sorts of leadership. Lorenzo de’ Medici vs. Machiavelli, or some university department chair vs. Darwin, or Steve Ballmer vs. Don Knuth, &c. Sometimes these qualities overlap, as in Caesar, say, or Steve Jobs.

Also, decisiveness is not the primary factor: there are plenty of decisive people who never possess anything like the “leadership” she’s talking about.