I think it's a interesting discussion, because often when CEO comps come under scrutiny, one side will naturally argue that company performance correlated directly to CEO performance.
Stock goes up = CEO does good job
Stock stagnates or goes down = CEO does a bad job.
It's an incredibly complex ting to analyze - but how much of company performance is really the result of the CEO, and the CEO alone? Sure, he sets the N-year course of the company, and being the navigator and captain of a ship, you should get some reward if the ship arrives its destination, intact, and on time.
But I mean, how much of Apple company performance is nothing more than just built up momentum? Apple doesn't need to be revolutionary or cutting edge. They just need to adopt working/in-demand products to their own (Apple) domain, and their brand name alone will sell those products. Those Foxconn workers would likely have their jobs, Tim Cook or not in charge. And if not Foxconn, then some other factories and factory workers.
Ok, that's a lot of rambling, but I guess my point is that when you're dealing with a behemoth of a company like Apple, with hundreds of millions of users locked in to their products, it's difficult to credit a CEO alone of the success.