Between creation and flood Adam’s variation would be expected to have been sorted to a great degree such that any man 1500 years later would only have a fraction of Adam’s variation. And yet, all variation in living humans, neanderthals and denisovans is said to have been derived from Noah’s family… I haven’t seen any YECs seriously tackle the population genetics of this great bottleneck.
Professor Duff, I would like to point out that you have not now done your research accurately. I know a good book that has taken this seriously. Guess what the name of the book is? I think it can also be found on your bookshelf. The name of the book is Replacing Darwin - The New Origin of Species
The book says (p.228) "Under the model of preexisting nuclear DNA differences, these bottlenecks would have been population bottlenecks, not Genetic bottlenecks. In other words, population bottlenecks tend to eliminate large amounts of Genetic variety only when the population size is kept small for many generations. The single-generation population bottleneck followed by exponential population growth (eg, the kind of event that describes the bottlenecks at the creation of Adam and Eve, at the Flood, and at the Tower of Babel) would result in the loss of far fewer varieties . "
See also endnote in that section to find a few other good “creationist” studies on the subject. I also recommend reading Chapter 9 of the book, if you want to understand, How many different chromosome combinations would be possible in the 6,000 years from Adam and Eve until the present? I think you have great difficulty understanding this and it is the understanding of this that is the key to understanding how all this immense diversity may have been packed into two individuals.
Of course in the Swamidass first post link, Jeanson says this thing well, but maybe you didn’t look at it carefully.