Scattering the intelligent races across two planets is easier said than done. We decide to start with the Dragons and beasts on the second world. Both groups are largely self sufficient even as newborns, though we will be creating slightly more developed bodies for many of them.
Bringing them back doesn't matter if they just starve to death after all.
All of us have mastered that process now, and the actual creation goes quite smoothly, until we've got tens of thousands of bodies ready to be inhabited. I can't guarantee the souls will stick to the same species every time, that's all part of our research, but we tried to get the ratio correct.
I haven't seen a great number of Dragons or Dragonkin die, so they're are thousands of beasts to every Dragon, which I'm hoping is a reasonable ratio. Dragons are large, powerful and hungry creatures after all.
