I thought this was settled? Barely Sociable figured it out.

The Most Elusive Identity On The Internet - Pt. 1

The Most Elusive Identity On The Internet - Pt. 1

TL;DW There's a compelling case to be made that it's Adam Back. I don't remember all the ins and outs, but the best I recall, he was active in early-bitcoin-prototype development and then suddenly evaporated at the same time that Nakamoto appeared, and took a respected position among people Back was already working with who would have had no real reason to put trust in some random other stranger-person. Also, they speak similarly, and at least once Back gave odd answers in media interviews that don't really make sense from the perspective of him not being involved in keeping the secret.