Many thanks for the comment, that +Spd build you shared was something I'd been considering as I brainstormed ideas.
However, I'm not seeing the need for 51 Atk to ORKO Takumi, as with a Def boon he'd have 29 Def and at best 40 HP, meaning she'd only need 49 Atk to take him out. If you'd factored in HP AND Def boons, then 51 Atk would be needed.
By the way, does anyone else have this issue where Cordelia(or any other character) just blends in with other characters? I can never find her in the character list screen, even when I'm staring her in the face. It always takes a few extra seconds to locate her.