I noticed Shadow's fight DPS seemed to be growing rapidly towards the end of the game, so I threw a hyper wrist and a muscle belt on him and brought him along to fight Kefka.
And he did this. Every. Turn.
Jeebus.
So Locke spammed X-Potions and Celes and Terra took a well-deserved nap.
(L36 / EL25, 2x Orochi, Hyper Wrist, Muscle Belt, v1.8.5)
PS. Loved this mod. Amazing work.