~snip~
Yes, if it was a crew or a group project as you say, it would explain why Craig Wright is so confident and arrogant when he claims to be Satoshi Nakomoto, he knows it was a team, and he belongs to it one day, or he considers having fully been part of it at least, and thus being one of the several Satoshi Nakamoto existing. IMO Hal Finney was the main author of the white paper but he wasn't able to code, to test and to market it alone, so he asked some people to help him for free, against IOU or just cash money.
I don't think there's much evidence to prove it was a group of people. If anything, I think it was just a single person.
Satoshi himself posted about how he was working on it for about a year or so, without mentioning others. Also here's another quote that points towards him just being one person:
"It's very attractive to the libertarian viewpoint if we can explain it properly. I'm better with code than with words though."
Basically he wanted to include the rest of the people, but it seems pretty clear that the project started with only Satoshi as one person.