Satoshi uses British English and inserts two spaces between sentences. Does Paco Ahlgren?
I noticed that too.
Satoshi gives some credit to others here:
https://bitcointalk.org/index.php?topic=342.msg4508#msg4508and does not mention Paco.
I think Satoshi is one person. It's too difficult for a group to stay cohesive enough to maintain anonymity.