Cook is a great manager, a whiz when it comes to managing supply chains and keeping the trains running on time. He is vital to Apple. Jobs cannot do what he does. But neither can Cook do what Jobs does. The fact is, Apple needs both of them. Forgive me for the analogy I am about to make — but if you’ve seen the latest Star Trek movie, then you might understand how Cook and Jobs work together. Cook is Spock: low-key, cerebral, methodical. He’s the Apollonian counterpart to Kirk, the Dionysian hothead. Kirk is impulsive—but nobody would deny that he, not Spock, should be captain of the ship.