Do you believe Satoshi was a pseudonym used by more than one person that's why there's differences in written English ?
What if Satoshi purposely wrote varied English styles to make people think that he isn't one person?
So what you're thinking about him right now, is exactly what Satoshi expected.
If you are referring
satoshi account in this forum, I assume it is operated by a single person. Why? Can many people together use 1 account for a serious thing like this forum? I am not sure if many people are possible to trust each other for this matter. There should be one leader in a community forum and the leader won't share his private thing like using a forum account together, even with his friends. It probably risks him.