We do know who Satoshi is. its Craig Wright. He even provided documentation to prove it. Along with that he said that he wants to keep his private life intact and only wants to be left alone. If you look at the process of the whole fiasco it took some time before the creator of Bitcoin came out. The reason for that is most likely because they did not want to become famous or targeted because of the disruptful nature of Bitcoin. Inevitably he was stuck between a rock and a hard place because the future of Bitcoin was influence by the secureness of the currency. For the bitcoin users to remain confident in the legitimacy of Bitcoin, the creator had to come out.
this matches only one person, the person who provided proof, Craig Wright.