I am curious to know who had been the owner of the account with user ID "2". This account is even older than Satoshi's account and it is already removed.
I guess that's satoshi himself as it is named "admin" for the first account that's been deleted. You can get some good but limited info here
A Study about history of Bitcointalk Forum. In regards to the second account my perception is maybe it is one of his alts as well.