I think Satoshi should be a group of people. Because of the need to create bitcoin is not a person can complete the project. This is too hard!
Hal Finney, David Chaum and Wai Dai all wrote their own e-cash software by themselves. Nick Szabo also wrote a rough one in 2005 that he called Bit Gold. Bit Gold was described almost identically to bitcoin. He then got someone to help him finish the code in 2008, and launched it as Bitcoin under the pseudonym Satoshi Nakamoto.