I believe that Satoshi Nakamoto has a higher probability that he is only ONE person, since if it is a group, there is a much higher probability of this information being leaked.
Also there are theories that Hal Finney IS Satoshi Nakamoto.....with Satoshi's disappearance coincident with Hal Finney's pass away.
I do not think that there is any clue through which we can say anything about satoshi nakamoto. Even though it can also be a reality that he is a single person and is a live, but it can also be possible that it is name of a group where they work as a team. i think it is a misty and as soon as it will remain as misty. there will be more value for that.