DIS Investigations on the scene again...
Typically User IDs (UIDs) are assigned sequentially, starting at some arbitrary value.
Pete's UID on the system appears to be 1721. His "Join Date" is 06-01-1997.
Baloo is 1719, with a join date of 04-21-2000.
There are no single digit UIDs, but some random checks show that there is a UID of 500 and 1001 - but they have join dates AFTER Baloo.
So this tells me that at least to start the UID allocation was NOT sequential, at least when the current board incarnation came about. It could have been an import of users from a previous version, and the order was arbitrary based on how they were exported from the old system.
Which means unless WebmasterAlex gives me access to the database, I've got nothing