[quote=Flamelord]
Let's see if I understand it. Reno is Oner, and Oner is Reno, two sides of the same being. Only one can be the dominant personality at a time, though in extreme circumstances one can draw on the other to boost their own abilities. Am I close?
[/quote]

hmmm, somewhat. 

Its more like the two are their own beings, but they are also each other, like Persona for instance (I am thou, thou art I). They are two wholes that are also two halves of the same existence. They can combine their selves and merge to temporarily transform (resulting in a cool appearance change, again read Oner's CS) and combine their mights. As seen in my post when Oner (transformed) spoke, he spoke with both Reno's and Oner's voice, which is more like them both being out at the exact same time, them both being the 'dominant personality' as you put it.