I imagine they may just be the only two that the poster knows about. It's not like it's a radio button poll, though. It's enough to spawn a discussion. Someone that knows can respond in free-form.
http://code.google.com/u/dborowitz@google.com/ http://code.google.com/u/dborowitz@google.com/ - wow, neat to see dulwich in use for such a big project.