Some Garuda EX issues solved
First off, OT takes Suparna, not Chirada. That way, MT doesn't have to worry about getting one shot.
Second, Suparna has a very clear rotation, which means you know when you'll get hit by Wicked Wheel, and melee DPS can know when it's coming and get out of the way as well. I haven't been able to find it anywhere, so I figured I'd post it:
Downburst > Slipstream > Friction > Wicked Wheel > Repeat
Her rotation changes after the rocks are destroyed though, so that Friction comes after Wicked Wheel if I remember correctly. Still, makes the fight SO much easier knowing when it's coming and being able to survive without any issues. And the Stoneskin Chirada gives Garuda disappears almost instantly, so that isn't an issue in the least.
Edit: Also, something I never see people saying, when Garuda puts the blue tornado around the outside, have everyone stack right behind her. Then, when all the feathers are grouped, OT takes Spiney away, and the group nukes both the feathers and Garuda. Feathers die fast since they're clumped up, and Garuda takes some extra damage.