I was going over this earlier on, and thought of the pokemons Resharim and Zekrom as Ying and Yang. They both fill eachother up, and have both its weakness. Together they are cool and stuff, but when its not in balance, its going out of control.. What if Kyurem is the emodiement of the balance? Ideals, truth, but whats left in this ...I have the feeling something is missing.
Then again, might have been mentioned earlier, but the eyes of the 3 pokemon seem to relate to eachother, as resharim has blue eyes, the color of Kyurem. Zekrom has red eyes, the color of Resharim, and Kyurem has Yellow eyes, the color of Zekroms Thunder. Hmm,
The fact thats its base stats are lower might indeed relate to the original dragon, but what if there was another from, and the REAL dragon has yet to be seen? What if Kyurem has the ability to shape form, like Arceus and Genesect using items?