I think ref's and commissions need to show some leniency though, I mean when Junior knocked out Cain it was right behind the ear which, if we use big John's definition would've been to the back of the head. I agree there should be a more definitive way to call it but I don't think the head-phone analogy is 100% the way to go.
It happens a lot in this sport, sometimes purposefully but more often then not it's completely unintentional and I think the most important things to try and distinguish are things like: were the shots intentional? Did the recipient of the shots move his head in such a way the shot was unavoidable?
Perfectly avoidable... Is fighter eager to KO his opponent any way possible? YES. Is it avoidable to strike ilegally and possible to control yourself and respect the rules? YES it is.
It would be unavoidable if Gonzaga's head suddenly changed motion but this did not happen, watch the tape.
Gonzaga was far from energetic and movable at that moment...
and Travis had all the time in the world to see where his final elbow strike is going ...(the elbow that caused KO and made referee stop the fight)....
So in my judgment I would say it is an ilegal victory and Gonzaga deserves a completely new match.
It all seems to happen so fast i know but it is not fast in the octagon subjective perception of time slows down so keep that in mind too.
What worries me is that Travis had a feeling, a hunch or perhaps even a concious thought...that this would go unpunished.
It's the "I had to kill him!!" syndrome i m afraid.