The thing is you're basing everything on records and not the skill of the fighter itself. If you watch Silva's fights, he absolutely rolls through his opponents. Don't get me wrong, GSP is one of my favorite fighters and he's one of the best in the world, but he can't control fights like Anderson Silva does.
I don't follow Pride as much but I do realize they have world-class fighters over there, including Fedor, Wanderlei, and Mauricio.