AAPL) CEO Tim Cook. At this dinner, according to Icahn, the billionaire will learn about the "magnitude" of Apple's stock buyback. Tim Cook's puppet strings have already been pulled -- by Icahn and David Einhorn -- now it's just a question of how far he's willing to go. This has nothing to do with Apple's eventual success or failure. In my recent articles, I have rhetoricized the possibilities in that regard -- along a crowded spectrum from positive to negative -- six ways to Sunday. Make no mistake -- Apple remains best in breed; whether or not it can stay that way nobody knows.