When using the Elemental Burst {LINK#S11165}Supreme Instruction: Cyclonic Exterminator, all your party members will gain the Parameter Permutation effect: Increases Ineffa and your own active party member’s Elemental Mastery by 6% of Ineffa’s ATK for 20s.
Regarding the alternative for Bennet. Xiangiling might be better. Swirl doesn´t scale with ATK and ...