In a world built around measurements, athletic accomplishments are always judged more by subjective opinion more than actual facts. It's easy to look at an NFL game and say that a team is 10 yards from a touchdown or inches away from a first down. It's much harder, however, to compare one team's season versus another and declare which was more successful.
In the sport of mixed martial arts, the easiest measurement to judge a fighter by is their professional record as well as the level of competition they've faced during that particular run. Drilling down a fighter's record can be as easy as looking at the list of opponents they've fought while studying their accomplishments in the sport as well.
There is also the method of looking at how victory was attained and the nature of lopsided wins or losses. In the case of UFC 166 heavyweight, Daniel Cormier there's not a lot of argument against him being rated as one of the best fighters competing in MMA right now.
Currently sporting a ...