In other words, I think you’re being ridiculously over-generous in your interpretation of ancient knowledge.
If it were in fact the case that the ancients had any real notion of Darwinian theory, I think they would have stated it in unequivocal terms, as they did with so many other Platonic and/or Aristotlean concepts.
Vaguely suggestive biblical lines interpreted as somehow suggesting an understanding of Darwinian theory strikes me as wishful thinking.