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Hes the guy that made all of the original discoveries and anytime you hear an interview or read an article he has a tendency of pointing out something that you hadn't heard of before.
Of course hes also very capable of being wrong.
The tone of Doc's article suggests that when James' says something its near fact, but James himself has admitted that good local analysts will be more knowledgable about their team's player than he is.
There is just a limit to how much you can cover.