all of naboo's technology and architecture was very elegant. Its only natural that the fighters be similar. They are their own separate culture, and they made their fighters to reflect that.
and you ARE only 6 prople away from knowing everyone on the planet, but 'knowing' is a term used loosely. 'Knowing' consists of having met, 'talked' to (for instance reading a post by) someone, not the relationship of a friend you are thinking of. Everyone here counts as a link in the chain to knowing 6 people. A really fun way to prove this is the Kevin Bacon game. Pick an actor, any famous actor, and they can be linked to Kevin Bacon somehow. Through movies, but the concept remains. And I'm pretty sure it can be done in 6 links or less.
anyhow, my point is that the universe, while physically large, can seem very small if it is easily accesible. Which I think is part of GL's point.