There's no reason satoshi has to be a group of people.
We know about Wei Dai, Nick Szabo, Adam Back, Hal Finney, and all the people who contributed to cryptography, public key cryptography, hashing algorithms - all of these people contributed to the ideas behind Bitcoin. Even the guy who created Bittorrent helped pave the way for P2P networking. There are countless people whose work made Bitcoin possible.
But none of those people kept their identities secret. Why would they suddenly all agree to start making their work anonymous?
It's possible that satoshi put together their work into something new, without their direct involvement. And based on the small number of people mining after launch, it couldn't have been a very large group of people. There definitely weren't a large number of computers involved, which means it was probably just a few normal people with regular cheap computers and not a lot of money, resources, or connections to help get this project going.
Hal Finney was probably the closest thing satoshi had to a partner, and his role was mostly limited to testing the first transaction. He only mined a few blocks. So if satoshi's choice for the first transaction recipient wouldn't even run a computer to help maintain the network, then where was this supposed group of people working together?
If you think it would take lots of people to help refine the code, then you are correct. Lots of people from Bitcointalk have been contributing code for years. Bitcoin was far from a finished product when satoshi released it, and it's still not finished. So if it was designed by an elite group of geniuses, why have they needed so much constant outside help?
There's no proof either way; some people think the evidence suggests a group of people, but the evidence can also point to a single person.
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Very valid points.
1. It doesn't need a group to come up with an algorithm that is unique and never done before
2. Every concept was already available. All Satoshi has to do is join them together. (hashcash, p2p, merkle, timestamp)
3. It doesn't need a group to mine genesis block, few PC's and resources would do.
4. If it was a group, for the kind of fame "Satoshi" have got today and with the kind of money involved, Someone in the group would come up by now to claim it for sure.
It was always a SINGLE person IMHO.