Head dog has the advantage for that reason and the fact that the other dog's head is where its weapons are.
He who controls the head controls = how much he gets bit ...
Meanwhile, he whose head is controlLED = he who is ineffective.
The only other place you can bite, and not control the head, is deep in the throat.
From a tactical standpoint, breeding for dogs that control the head = breeding dogs that control the deal.
Jack
We do similar things, just in reverse: I breed dogs that latch onto the head and then, hopefully, shoot for the throat
I prefer to try to establish control immediately, which almost invariably comes from a head-hold.
To me, a head-hold is like the jab of a good boxer ... and going into the throat a right cross to finish.
It is harder to land your right cross, if you've not first established control/range/timing with your left jab.