Rickson Gracie vs Matt Hughes in their primes. Who wins?

would this dream fight be the biggest martial arts/mma event of all time, even overshadowing a silva-st pierre fight? does anyone have any perspective on how this match might go? is it likely to go the distance? i've heard some say that hughes, at his peak, was a beast that no one could handle. one of the greatest wrestlers with jiu jitsu black belt skills, (according to joe rogan) even though he is unranked.