Mesmer Zerker Questions
The only time that staff really scales with zeker gear, is when you use the mage phantasm on open world bosses with max conditions stacked by other people. Or if you use a shatter specc in dungeons, and then the staff is nothing more than a clone generator with a defensive cooldown in chaos storm.
That said, I sometimes take the staff to apply chaos storm as an extra defence, and maybe with the clone generation on the odd occasion now and then. But sword/offhand and even the greatsword usually perform better in dungeon settings.