The thing to keep in mind is this: Apple tomorrow, a week from now, and next month is the exact same Apple from yesterday, a week ago, and last month. Tim Cook wasn’t named “CEO” until today, but he’s been the chief executive at the company since Jobs started this — his third — medical leave back in January, and probably even before that. Whatever Steve’s role is going forward, it’s only different in title than what it has been, in effect, for some time.