I have a few points:
1)CEOs do not, and very typically ARE NOT, charismatic and flashy and cool people such as the infamous Jobs. Period. CEOs are people with an extreme amount of experience in running companies and/or divisions of companies. They have leadership experience and vision. They typically are NOT in the day-to-day tasks of building/designing products...that's what Product Managers are for.
2)Steve Jobs is something of an urban legend...smart, mean, in people's faces all day long, hands are in the design of every single product/feature. He originally started/owned Apple so for a long time, yes, those points made sense. But 99% of CEOs of publicly-traded companies did not start the company...they were brought in to make a company even better...and maybe even take a company Public.
3)I really have no idea what Cook does all day long and that's fine...I have no idea what the CEOs of 100 other companies I can list here do all day long, too. At the end of the day, Cook (or insert your Apple CEO here) needs to report to (unfortunately) Apple Share Holders...the ASH want to earn money...how does Cook make them happy and make them earn money?...by creating good profits, instilling promise that there will be growth, and introducing new products/services that promise to earn new avenues of money for the company.
I don't think Steve Jobs was the best CEO of all time...he introduced some great products in the 2000's and turned the company around...his "presence" was really inflated by the legions of loyal Apple fans...kind of like a fan base of some hot new recording artist.
If someone is looking for the next Steve Jobs (in all aspects of him), you're going to spend a long time looking for that person...If you're looking for a CEO that's going to lead Apple and turn a healthy profit for Apple and the Shareholders, heck, there are a lot of CEO's out there that can do that. Is Cook that guy? I don't know...I think he needs a little more time...Jobs obviously recommend him...Apple shelled out a boatload of money to retain Cook...but if he gets axed tomorrow, either the Board knows something we don't or they're making a poor decision based on comparing Cook with Jobs.