Start again....level up Cecil with Rayida and Tellah in the dessert get Cecil to level 10-13 Tellah to level 4-10 Rayida to level whatever you want.....then when your a Paladin level up Cecile with Tellah and the twins..level Cecil to level 13-19 Tellah to level 15-17 the Twin to level whatever.

Then do what you will the rest of the game..Just train after you get a new character(exept Edward)