I think that people who work with Satoshi Nakamoto had the greatest opportunity to find out more about him,and maybe some of them know something more,but to this day kept the vow of silence.Every attempt to analyze his linguistic will not reveal a lot of details,except is he/she native english speaker from UK or North America or Japanese which is excellent in english writing.
By analyzed data most of investigators conclude that there is a great possibility that person who write Bitcoin White Paper and person who exchange e-mails are not same person.So conclusion is that it's about more people then only one.
One of the a person who is involved from the very beginning in
BTC development is
Hal Finney,and he is write on this forum his opinion about Satoshi Nakamoto :
When Satoshi announced the first release of the software, I grabbed it right away. I think I was the first person besides Satoshi to run bitcoin. I mined block 70-something, and I was the recipient of the first bitcoin transaction, when Satoshi sent ten coins to me as a test. I carried on an email conversation with Satoshi over the next few days, mostly me reporting bugs and him fixing them.
Today, Satoshi's true identity has become a mystery. But at the time, I thought I was dealing with a young man of Japanese ancestry who was very smart and sincere. I've had the good fortune to know many brilliant people over the course of my life, so I recognize the signs.