So the theory here is that the greatest CEO of all time was able to mind-meld his vision, drive, creativity, discipline, and all his other forms of genius into the corporate structure of Apple? Oh brother. Do you guys hear yourselves?
Are you saying Steve couldn't train others in what is impotent and what is not? The only choices are "Steve was the only Apple employee" or "Steve had no influence at all"?
None of the Apple execs are the same people they were 10 years ago. This is a joint interaction between them and Steve. Those changes have the potential to continue to guide Apple successfully (but it is by no means certain).
It's not different than my kids following my beliefs if I died today.