When you take in the length of time (well over 2000 yrs) this trait has been selected for ,you'll have a better appreciation of what your dealing with.
I've got a Saipan x dark cornish that looks a lot like this bird!! He is on the keeper list just because I like his color and build. He is also DEAD GAME. He absolutely will not stop fighting if I try and introduce another rooster. I've went out and picked him up after he over heats...