I’ll also have to respectfully disagree with you on this. If I’m listening to someone speak on a topic who is by your 3rd definition an authority on it, that is not a yardstick for them to claim correctness. Yes, i might probably be better off listening to them than a lay person, but it still doesn’t give them the right to claim correctness nor does it grant me the right to rehash these claims and say that i should be listened to since I’m regurgitating the words of an expert. All assertions should be backed up by verifiable sources.

I’m interested to hear about that book though