GA draws and GP tie breaker

I have yet to experience a tie, as there is so much to factor into each individual battle. Doubtly you can "force" a tie based on how you place defenses, or any other means for that matter, so I don't see how it will be abused. And still, you have better chances of either winning or tying if you simply play to win. I like OP's idea, and I agree that logically the underdog had to fight slightly harder to become level with the player with superior GP.