Hai.
Now That i have your attention,
i think kyurem IS the husk of the other two splitting, but i also belive that B/W Kyurem prove alot of things. I will list what i can Connect.
ZEKROM/RESHIRAM is fused with KYUREM easily.
If kyurem is fused with BOTH, what would suffice? would the World collapse from the emmense power of True Kyurem? or would The three just dissapear? would it just fail? who knows. anything might happen. if X and Y Reveal something about this, things would be solved. but considering *angered* GAMEFREAK, that most likely wont happen. If anyone wants, we could leech gamefreak/nintendo by agreeing on one rumor, assuming it true.
2
If A true dragon existed, kyurem may be the body of the dragon afterwords. anyways, i like kyreum the way he is. its cool. someone i know called it a chicken, almost punched them.
3
im getting off topic, so i will focus now.
That one dragon that kyurem was, would look nothing like it except the diamond on its head.
4
Arceus might have created it as its Protector, and lost power doing so, and made humans to occupy it until it was split, creating kyurem.
i cant draw or sprite, but if you can i want you to try to do this by description, if you do, pm me with it or post it here. Now imagine this:
A easily 6 foot dragon and then some.
It walks on two, powerful legs, maybe two feet wide, and four feet high.
It has a powerful silver torso, and two winged arms in a deep black. they pulse a intense flame out of them.
it has a mouth like kyurem's, but not frozen, an with two grey mane-like tails, and one reptilian one, darker than the other two.
it has a golden diamond-shaped crest in between each one. it has vast white wings pulsing elecricity, shaped like zekroms, but fur can been seen around the edges. it has a massive tail filled with two mixed energies. it's back is grey, lightening on the side, darkening in the middle.
i dont care about everything else. sorry for long post.