OP, ask yourself: if you invented competition to the traditional banking and monetary system, would you like your identity to be known?
the entity using the satoshi pseudonym is one person. that is established.
Any conclusive investigations regarding if he was indeed a single entity or not?
Not only that, presumabely the first reason for him to hide is identity is because he is holding a big amount of coins, and without privacy everyone would seek him to kill him and steal his funds, his life would be at danger
Someone who wouldn't want Bitcoin to be developed would find him first... But yes, that's a reasonable hypothesis too.
This do not prove that he was alone, there could be other that were helping it, but he was just the central authority of the group of coders/designer?
My point, exactly...