Could Adam and Eve Have Been the First Embodied Persons Within an Existing Homo sapiens Population?

It was not meant to.

It was meant to clarify the difference in approach between a priori assignment of personhood, which would appear to be your approach, and a criteria-based asignment such as the one that appears to flow from Zizioulas’ framework (which was the subject I was repl,ying to in my original post on this thread).

I was attempting to compare and contrast these two approaches in an attempt to tease out their implications and possible strengths and weaknesses.

Think of this as analogous to taking two maps of the same region and overlaying them to compare them.

This perhaps impinges on an area where your foormulation seems problematical to me. You assume the existence of a soul, and then assume that those that you assume to have souls posses personhood.

When you assume this to apply to “every currently living human being”, this is relatively unproblematical. But somebody else could take this framework and assume that Jews (or that people with red hair) lack souls, and attempt to deny them personhood. Alternately, somebody could assert, without any real way of disproving their claim, that chimpanzees have souls, and therefore are persons too. Souls are undetectable, so it is the assumptions about them that is doing the heavy lifting in this approach.

You yourself seem to acknowledge this issue when you state:

Nor can we tell from this evidence if they possessed moral-autobiographical capacity. Being extinct, they are more of a hypothetical example than an actual one. But that is not to say that actual examples will not eventually confront us. One possible example would be alien lifeforms. Would a race of intelligent amphibians (something that I’ve encountered in multiple science fiction novels) have souls? Would we admit that they are persons? What about our own potential intelligent creations, biological or digital? We will eventually need to confront whether at some point we need to admit them as persons. To my mind, the question of “how do we define personhood?” should be leading us to at least think about such implications.

I think the disagreement is more basic, and less interesting. I don’t draw any metaphysical conclusions about humanity based on its history. I don’t know whether “biological and cognitive reality exhausts” anything about a “personal subject” but I also don’t care. Because I don’t see a hypothesis in your writings. This is not an insult; it’s just a statement about what I take a hypothesis to be, and about the things I find interesting and important. I take a hypothesis to be an attempted explanation, and I take explanations about the world to be interesting and important. Human consciousness may indeed be a mystery, but I don’t see a hypothesis here, perhaps because I don’t think there is a question here, and there sure isn’t an explanation here.

Thanks for the response and for your visit to the forum! I think you may find others here to be better conversation partners than I am, at least on this topic.