You get Flare to chain from Holy, eventually. Giving him an HP chain move (the only one he's gotten by level 85 so probably the only one he can get) to use at range, and there are times when it comes in handy.

His combos work differently than the characters they are derived from, but I don't think they're worse. Slidehazzard is an excellent air attack. It closes with the enemy, does good combo damage, and finishes with a wall rush. Climbarrel is a nice Cloud/Squall combo that does a rush toward his opponent, moving into Squall's gunblade combo.

Oh, and he also gets Terra's Flood Spam.