Ed Feser is a generally OK theologian. A smart dude. Not a flaming Modernist either. And he takes the biology seriously. His theory might be OK to believe.
Here are two articles by him related to the subject:
Our friend John Farrell has caused a bit of a stir in the blogosphere with his recent Forbes piece on modern biology and the doctrine of ...
edwardfeser.blogspot.com
and
In part I of this series (and in a response to critics of part I ) I addressed the question of whether monogenism of the sort entailed by...
edwardfeser.blogspot.com
These articles might not be the very last word on the subject. The questions are 1.) Is this good biology and 2.) is this good theology. I am going to guess that it is in both disciplines but I am a cautious biologist trained in genetics and biochemistry and a bit of population ecology so I seldom just jump on a bandwagon.
I am generally going to stick with Pius XII, particularly Humanae Generis. I am not going to be a polygenist. But I stretch monogenism to be a clan rather than one couple. Or by some definitions I'm a polygenist but only a 'limited and modified' polygenist because I hold to an original clan at the fall and not a bunch of clans or tribes or races or subspecies. I hold to original sin and am not giving that up, full stop, end of story. It's just too real a thing (see C. S. Lewis on that) to ever abandon.
My hunch is that a clan of up to 10,000 people, that included some Neanderthal ancestors, led by a figure we can call Adam. God gave them souls. And they chose to sin
This does not have to be the genetic 'Adam' or the genetic 'Eve', which could have come later but not before. For all I know ensoulment applied to all of the genus Homo. Thus maybe the genus evolved and all Neanderthals and Denisovans and all Cro-Magnons and even Homo Erectus were ensouled, but some died out later. There are lots of possible ways it could have happened. I don't know.
Catholics are free to be creationists. Or, within limits to be evolutionists. The Jimmy Akin video explains how we can even approach polygenism a bit more broadly today. I myself am not gung ho to go there because I want a single fall and a single ensoulment, albeit with a clan instead of two individuals.
Science, good science, is important. So is good theology. In the end they do not conflict. Feser, being a competent and faithful philosopher is looking at how the two sciences mesh. I think work like his can be fruitful. I would like to see more work on population genetics to know what our human roots really are. Particularly our Nenaderthal and Denisovan roots.