Because Subterra is an attribute that relies on brute strength, Haos isn't. Haos is one of the biggest and most strategic tricksters in the game. There are so many cards in the game that give Haos a great advantage, esp those lower numbered ones. "Strong" is subjective really. In Bakugan, you really have to make something work for YOU by knowing it inside and out.And really, why would a "Light" based attribute rely on sheer power anyway, that doesn't make sense.