Satoshi Nakamoto is the creator of bitcoin, Satoshi left because he wanted us to realize we are the Satoshi. If you are one of the bitcoin developers and/or holders, and you believe you people are Satoshi, then you are Satoshi. Anyone adding to the progress of bitcoin is Satoshi.
We keep saying this, because it sounds nice, but I personally think that he didn't leave the community (only) for that purpose. A person that holds an enormous number of bitcoins would not
be fair to spend them. Satoshi had realized that he had created something that would change the world, the way money works. He never spent a bitcoin (from those that he mined at least), because he didn't want to take advantage of his project. But would this be enough? No! If some people knew that someone owns a million coins they would be pissed off. Imagine seeing the creator of bitcoin posting everyday here on bitcointalk. It would be a disadvantage of bitcoin that one person owns most of the coins. Not to mention that he wanted to hide his identity.
Saying that we are all satoshi means that we all have the same power over the
creation and that's true. Although, opportunities are not the same and this is what matters after all. I wish I had got an advertisement about bitcoin back in 2012.
Why does it matter at all? What will you do if you know who Satoshi Nakamoto is? As a bitcoiner, why can't we stop discussing about it? Why can't we just let this mystery unresolved?
The simple answer to your question is - "No one knows"! And I personally would like to keep it that way only! There's nothing we are going to achieve if we know who Satoshi Nakamoto is so please put an end to such discussions!
If you had taken a better look to my post, you would see that I'm not querying who is satoshi nakamoto. I know that it is an unresolved mystery, I'm just asking who was the first one that ever questioned who satoshi may be.