I don't think it should really make a difference. No other sport doesn't go by this method for any title. If I lose game for #3 and win 3 more after that, I think a dog should still have the right to be GrCh, the dog still earned it. JMO
Yes, only a clean 5xW should be Gr Ch.
No, if a dog wins 5x he has earned his title of a GRAND Champion (something beyond a mere 3xW),
I don't think it should really make a difference. No other sport doesn't go by this method for any title. If I lose game for #3 and win 3 more after that, I think a dog should still have the right to be GrCh, the dog still earned it. JMO