Their rankings take into account a whole bunch of factors and I believe they are set up using mathematics, not just some fat guy deciding who is the best on the planet.
If you don't fight for 6 months i'm fairly sure they take you off the rankings. Fairies Nuts IMO (fair enough).
and yeah, Kampmann is the man! He could very easily be on a 7 fight win streak right now if the judges had been a little kinder to him. Erick Silva will jump so high up after he dominates Fitch.