The reason why THA has good defense is because they are "SHORT". You may think it's a weak point but if you think backwards it gives speed when they dig the ball up. They get to the ground faster. If you are tall it takes like a couple of milliseconds longer. In professional game a millisecond matters. And you don't need to be that tall to be the gunner. You just have to work hard. The lighter is your body, the easier you can jump up.