I think the term gatekeeper is FAR over used in general. People use the term to describe a guy who fights good fighters, but won't get enough wins strung together to ever get a title shot. The thing about that is that to even be in that position they have to be pretty good themselves, and be capable of putting together a few wins. That isn't to say the term shouldn't exist at all. Rich Franklin was a gate keeper at middleweight during Anderson reign. That's not a knock on him, just saying that he wasn't getting a 3rd fight with Silva. Bisping probably should get the label, but even he could eventually get over the hump, and win a fight that puts him into title contention. Sonnen was probably gonna be a gatekeeper at middleweight after the second fight, but he changed weight classes to avoid the situation entirely. The same is true of Edgar, even though, in my opinion, he beat Bendo (the second time for sure) and Aldo. To me to be a gate keeper, you would almost have to have had 2 fights against the current champ, and lost convincingly. I could be wrong on how others even view the term, but that's just how I personally view it.
Big Hairy American Winning Machine