Hmmmm....lucky for me, I understood every bit of that. That leaves me with no questions. Impressive. My only thought:

If meteor is made from the "dark lifestream" then that means other materia could be made from it. So, using the "dark lifestream" to compress energy and make materia, could yoyu not make better/worse (depending on your vies of it) materia? Also, was Meteor made with a large amount, and its a great materia like Holy, or is it an equivalent to "Fire" or something. If it is an equivelant to Fire, how immense would a materia be if it were made equal to Holy? Or vise-versa, if it's equal to Holy, how strong would a materia be if it were equivelant to fire? Of course, these questions are not yet answered, but it is something that'd be quite interesting to know.