OK, so back to the battle. Yes, Dante would probably get devil mode before Auron gets an overdrive, but if Dante goes into devil mode with only 3 symbols, he'll be in devil mode for a whole 3 seconds or so. If I remember correctly, for me Auron always had more health than anyone else in my party, so he won't have any trouble waiting for his overdrive. One he gets it, he can just use Tornado and Dante will be in trouble. He'd be very suceptable to Aurons powerful attacks, and he'd be dead meat in no time.