Referring to Tim Cook as an "administrator" or "bureaucrat" betrays a stunning level of ignorance of his achievements. His significant optimizations of Apple's massively complex supply chain is the reason the company has been able to sell over one billion iPhones (and countless other devices) to date. So he has plenty of innovations under his belt. They are just operational innovations, so most techies tend to either not be aware of them or take them for granted (since it's not their domain of expertise).
What made Steve Jobs different was that he was a product guy and an incredible visionary to boot. He had the rare ability to care about details of individual products while also having a solid grasp of the big picture in terms of how those products should come together to form an ecosystem. I think Tim Cook tries to delegate those things to people who just aren't as good as Steve Jobs (naturally), which explains the questionable decisions Apple has made recently regarding their products.
So he's a supply-chain dynamo. Vastly different skill set than that of a strong-willed and opinionated designer. You are right though, he is delegating the 'vision' parts of his assignment to his inferiors and Apple suffers for it.
I don't know if you have ever hang around supply-chain people, but with the ones I know, I would not want them designing stuff.
You make it sound as if he single-handedly sold over a billion phones. What else helped sell over a billion iPhones? Saccharine, simplified, cheery, brain-dead UI; an army of Apple loyalists, explainers, and apologists (still mourning the loss of their Beloved Leader); several metric fuck-tons of marketing and advertising spend, a panoply of factors that result in a once-per-year or once-per-every-other-year purchase cycle, and a phalanx of impeccably-decorated retail locations, among other things. Sure, Mr. Cook plays his role, and Apple's SCM is best-in-the-world, but I think there are more Tim Cooks out there than Steve Jobs.
What made Steve Jobs different was that he was a product guy and an incredible visionary to boot. He had the rare ability to care about details of individual products while also having a solid grasp of the big picture in terms of how those products should come together to form an ecosystem. I think Tim Cook tries to delegate those things to people who just aren't as good as Steve Jobs (naturally), which explains the questionable decisions Apple has made recently regarding their products.