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.