"When a Napolitan Mastiff/Pit bull cross is matched with a pure pit, the cross bred dog can often bite down the pure pit down. Then he will (tend to) just stand over his "prey" uninterested in continuing. This is true. And it is behind the excessively hard biting (pure bred on paper) match dogs that when rolled to see what they have bite very hard, only to quit standing up when not even bit."

Yeah, I am not sure where he is going with this quote. It has been a number of years since I actually read the book. I will tend to agree with this statement for one reason, odds are if that cross is made it will be hard to find a pure bred pit that will weigh 100lbs or more. And a 100lb or better dog biting down on a smaller dog will always lead to the smaller dog being bit down. The odds of the mix dog staying there to finish is slim to none as well. And dogs with absolute freak mouth who are indeed game are few and far between.
And as much as I admire catch dogs the comparison of the two is unfair to both as both jobs are miles apart. The initial catch is intense and takes a dog with heart and desire and ability to stay there and I am a great fan. If the hog inflicts pain it is in quick swipes and cuts, and the catch dog is usually fitted with a collar. The catch does not last for an hour or two or even three. So as a pit bull guy I would never scoff at the accomplishments of a catch dog and I do not doubt these crossed dogs performed very well as catch dogs. But in the grand scheme of things it is like comparing apples to oranges.
Again, I am not sure where he was going by just reading one quote. But for me, I give credit where credit is due and if that particular mix produced A-1 catch dogs I have no doubts. If he means these crossed dogs would serve just as well in either area of performance I would have to disagree wholeheartedly. EWO