In a way, I feel like they already have some of this. Taunts with immunity and regen (or anything if you're Double), bursts that break the enemy's combo, stuns like Noise Cancel, wither effects like Battle Opera, and now Egret dive....Defense teams are doing fine. Plus, even their more offensive moves serve purpose. The stats on them can make them tanks, and killing off the enemy before they can kill you is one way to defend. It'll get you a win.