Akwakwak
I'm hungry
Looks more like a left/ right split to me but I agree. Reshiram has its right side Kyurem'd and Zekrom has Kyurem fused to its left side. Which kinda seems to add up what with reshiram and zekrom meant to have split from one dragon. Maybe we will see this one dragon.
This=mind blown. How come I never saw this, yes you are both correct, upon closer inspection it does look like that happened. Hopefully we do get to see the "epic dragon". Maybe it will be shown in a cut scene splitting apart before you battle your rival, and in order to get that one dragon you will need to have both of these guys.