I think the biggest problem with your premise and some of the idiotic responses defending it here is that rankings are not and have never been "who is the best fighter in the division."
If you are under the illusion that people going "Khalil is only number 8" means "This is my proof that Khalil is bad," then you are an utter fucking moron and I wonder if you actually pay attention to this sport or if you just like going "hehe, dat guy punch hard." What it does mean is: Khalil has not beaten anyone worthy of putting himself into title contendership, which was true before the fight, is still true now, and would have remained a true criticism of his shot even if he actually beat Alex.