You need to interrupt Hiruzen when he resurrects. You can even stop him from resurrecting by using GNW Sai. There is a youtube video with water main, GNW Sai, Choza and GNW Sakura.

x gnw sai x

water main gnw sakura choza

x x x

just fit in the summons and chases but talents need to be heal mystery, heal standard, x2 healing passive then you c*e experimental passive.