This fight has the potential of becoming a war of Gatti/Ward proportions, however it may also be said that it has the potential for being a dirty, mauling mess of a fight. With Castillos tendency to be litlle forgetful of the rules (particularily in relation to his head and use thereof.) and Hatton's will to retaliate when fouled the referee may well have the toughest job on the night. So i believe the ref. will play a key role in this fight.