Actually, you should put almost everyone at the back row, I mean...
Terra --- she uses Magic. Morph doubles it. Unless you want to use Atma Weapon then, oh well.
Locke --- he can use 'back row' weapons and I don't think capture affects his damage at back row. I rarely played Locke.
Edgar --- Tools. no effect.
Sabin --- Blitz, no effect.
Shadow --- Throw, no effect.
Strago --- Lore, no effect
Cyan --- Swordtec, no effect.
etcetcetc...
The only people I find a need to place at the front line are Gau, maybe Gogo, maybe Umaro. That's all =\