Bit of a contrdiction there.
I do agree with what you're saying though. Considering you provided a citation of your facts kind of makes it difficult to disagree.
There is quite a big gap from the creme de la creme (gsp, jon jones) and the rest of the wrestlers, even the guys in the top five. Chael Sonnen is top five, but I feel that the likes of GSP and Jon Jones are on a a completely different level.
For example look at Anderson Silva and the rest of the top five MW's. Those guys might be top five, but Anderson is still way, way ahead of them in terms of skill.