Deecey,

"Creating and rigging for Dawn on both sides will be much easier because it's the same model and most of the work doesn't need to be repeat like it did with V4 and Genesis (which were two seperate models)."

Precisly so. As I said before:
What do you need to make content is an exact mesh model in the right size and perfecty positioned. That is all there is to it. (the same go for morphs)

When the two models are the same = very little extra work involved. That is true progress, no thin outer veneer or illusory pipe dream.