I can remember the story:
On the SA2B board, Rusty was looking for players to join the "SA Elite", which consisted of players playing SA or SA2 on either system. Each Elite member had their own site which had their times, something Rolken considered a waste of space. He came to said topic and suggested an idea for what was to become TSC. Now look at it! :)
As a footnote, during the site's humble beginnings, links to each player's Elite page were available (for the SA2 players, at least). Interestingly, I didn't "join" TSC as such, I'm quite sure someone made my account and posted my SA2B times, probably Rusty, given he started the Elite.