Maybe all is not as it seems. Maybe Kyurem didn't fall off the meteor. Maybe it was where the Giant Chasm is now, and it summoned the meteors. Maybe it summoned them to split it into Reshiram and Zekrom. Maybe... I'm saying maybe too much. But this makes sense. Kyurem uses a super powerful Draco Meteor to split itself into the other two in its trio. But somehow, its original form survived. The meteors had damaged it, weakening it. These meteors may have released the ice from inside Kyurem that now freezes its body. Kyurem may have had no choice at the time but to gain nurishment from the people of Lacanusa Town. But now, Kyurem is stronger. The God Stone will grant Kyurem power, power enough to resume its old form. Power to rival Reshiram and Zekrom, Mewtwo, or even Arceus!
P.S.-Imagine the reaction of the people of Lacanusa Town if you let Kyurem out of its Pokeball after you caught it right in the middle of their city...
