Interesting the idea of gameness and aggression, greyhounds are game, they will drive their bodies to destruction to get contact with their quarry, well past the point most dogs would throw the towel in but not overly aggressive as a rule. Aggression is a different thing and as has been noted it doesn’t always collate with gameness and many aggressive dogs that start a fight don’t like to get it back.
Fighting bred dogs are different, I don’t mean bull crosses from non fighting lines, but real fighting dogs. I’ve posted before about one I had, bull and wheaten that had grandsires on bot