[Kenmoor]

Oh look, a Possible Spoiler Appeared (look an Old Joke Appeared!) That theory does seem to actually fit. Though Kyurem wasn't bothered at all by Team Plasma during BW it is the center of BW2 w/its new forms. I'm gonna bet that just like Genesect, Kyurem was experimented on by Ghetsis. I guess 2 years is enough for a successful experiment.
Or maybe Ghetsis pissed off Kyurem too much and he got frozen. Then while the protagonist is derping through the Giant Chasm they'll find a frozen Ghetsis.