That's a fine theory, but when it gets personal, isn't our faith in the Redeemer of the unsuccessful, marred, moribund and less fit?
I am trying to walk through the evolution-in-eden theology, which continues to challenge me.
Beings before Adam were perhaps somewhat like man, and God was pleased to let them die?
The lion was not lying down with the lamb in paradise, but the law of the jungle was natural and therefore pleasing to God?
Because death is natural, its acceptable, if not beautiful, because what? Because there was heaven during the time that there was "paradise"? So, death is ok as long as it isn't violent and unjust? Are parasites and disease allowed in paradise?
What is the goal of paradise, improvement of breeding stock? Revelation says that the future of man is bodily resurrection and life again on earth in paradise. The redemption is not by improving the species generally by natural selection, it is the miraculous intervention of God.
Your biggest problem is that your theory fails to pass the "Disney test."
Everything about the "Lion King" makes me want to puke. This is just a little too much "circle-of-life" for me.
Hakunnah Mettatah.