Middleweight champion  Dricus du Plessis puts his title eon the line for the first time on Saturday in the UFC 305 main event against former two-time titleholder  Israel Adesanya .  One fighter that will be watching the middleweight championship clash closely is former champion  Robert Whittaker .   Whittaker broke down the matchup and gave his prediction for the outcome on the  MMArcade podcast .  Whittaker has fought both men and is on the cusp on earning another title shot.       “It’s very hard to put a hard pick on either one of them,” Whittaker said.