But that’s what I am saying. That term suggests that Adam is at the root of every family tree rather than being now intermingled into every family tree. “Sole” means only, yet you are not saying that all the other lines around prior to Adam have died off. They contributed too. In many if not most cases those earlier men contributed to more slots in the family tree of many families than Adam did. So “universal progenitor” fits better.
I am not saying this to “call you out” or rush you. I am saying this to help you. I have already seen how smart people have misunderstood your work because of this very issue, and I know that bothers you.
Take all the time you are given on this rock, or never do it at all. I will quit mentioning it and wait to read your book. In the mean time, if you are able to show me a link from other threads on this forum where the other “Christ-centered” models are discussed, that would help me decide to take your advice to me.