Is there a concept which describes that the first discoverer or creator would not necessarily have been the only one?
Just because Steve Jobs lead the company that developed the iPhone, does that mean that nobody else would have ever created it? Or that they wouldn't have created something better?
Same for Dennis Ritchie, this says we would have no Unix, no Windows, no C, but wouldn't somebody else likely have come up with other similar methods for accomplishing the same tasks?
Not to take away from Mr Ritchie's accomplishments, clearly, that one individual had their hands in all 3 shows that he must have been a genius.