You will note that Ms. Applegate makes a reference to @Swamidass, and what some are calling the @Swamidass Model. [[ He discusses at length at his own discourse site:
www.peacefulscience.org ]]
Just in case you (or other readers) are not quite familiar, it is a dual-scenario, where:
God creates a large population of humans (with God’s image) by means of Evolutionary principles and his specific guidance of mutations, natural selection factors, and millions of years.
Then, at the right moment in the timeline, God uses his miraculous powers of special creation, to create (de novo) Adam & Eve in his little slice of paradise, Eden.
The scientific backdrop for the Evolved population is the conventional context under continuous improvement by anthropologists and micro-biologists, with Common Descent, Speciation and the like.
On the “theological side”, Creationists who can accept the “Old Earth” premise, have the option of putting the special creation of Adam and Eve in any period or eon they think suits the personal preferences of the Creationist audience and/or the denominational inclination they come from. Since the Creationist side is “miraculous” (just like the Christian view of the resurrection of Jesus), it doesn’t affect how evolution works.
And as long as it is an Old Earth scenario, there are no conditions placed on the miraculous creation of 2 special humans, with Original Sin, without Original Sin, however the Creationists want to develop their part of the scenario.
Finally, upon Expulsion, the offspring of Adam & Eve, begin to mingle with the existing hominid population (genetically identical at the species level). Computer-driven simulations show that even with the smallest of migration rates (and help from the Father in Heaven) - - from out of the ANE to the other continents (including Australia and the North Pole), within 2000 years or so, Adams offspring - - all the humans alive by the time of the birth of Jesus will have become the genealogical descendants of Adam & Eve (one set, out of many, of their Universal Common Ancestors). The fact that a small number of other mated pairs from the larger population will also have that distinction should not cause anyone too much grief.
It is the genealogical finale’ of this scenario that makes all the difference!