What, you think Steve did everything himself? Forestall, Ive,
Schiller, the guy who was in charge of the physical Apple Store, and Cook -- they all contributed to Apple's success.
The one skill that Jobs had that Cooks seems to lack is the ability to attract and keep A-class people. Jobs put together a great team of top-class people, and managed to get the best out of each of them. Unfortunately, that's the rarest of skills. It's disappointing Cook isn't Jobs, but someone like Jobs comes only once in a generation, if that.