What about Bahamut ZERO then?
The "great wisdom" of the Huge Materia is needed in order to acquire it, and there's a common misconception that you get it while you're in space, which Cid fairly creams his pants over (great sight).
(By "common misconception", I'm merely referring to the fact that in reality, you can get any combination of the Huge Materia and you're guaranteed to have the yellow if there's one, green if there's two, red if there's three and silver if you get them all... because the one in space is the last you'll get if you remember to salvage the red sub, it's often believed that the one in space is silver. Actually I'm not sure if that order is correct, but I am sure that they appear in an order, not in specific places.)