Mmmm, I would have to see the dog to agree/disagree with you.
Plenty of athletic dogs will shit all over themselves to a game dog they can "physically overpower," but who nonetheless is so game they keep scrambling after the more talented dog's ass.
In other words, just because a dog is "winning" doesn't mean he WON ... he is just winning "for now" ... and plenty of dogs, the moment they get tired, start to panic if they're in there against a game dog that can breathe ... precisely because the more talented dog senses he won't be able to stay ahead much longer.
So it all depends on the circumstances ... and I personally wouldn't want anything to do with any dog who would "stop scratching" while he knows he has an opponent in the corner ... seeing as, in Cajun Rules, scratching is the name of the game.
Jack
Edit: I would also like to add that the desire to finish (meaning to hit true kill spots), and the desire to "keep fighting" (meaning to continue to attack the other dog, even if it's only to shake a leg or a shoulder) are not the same thing ... and a dog who lacks the desire to "keep fighting" a dog he's whipping can hardly be called a game dog IMO.