I’ll explain by way of metaphor to astronomy.
Before Galileo, there was geocentrism. Every planet was thought to travel in its own sphere around the earth.
Galileo with his newfangled telescope witnessed the phases of Venus. The phases changed from one side to the other as Venus traveled its solar orbit. For the first time, here was PROOF that two other heavenly bodies were rotating around EACH OTHER and not around earth. Shocking! And it could no longer fit with geocentrism.
This idea that the fall caused mutations according to genetic distance from H. sapiens is kind of like geocentrism, but it’s anthropocentrism.
Noticing that rats and mice share some modifications that we don’t have, and that capybaras share modifications with rats+mice that we don’t have, is kind of like noticing the phases of Venus.
That is to say, here we have observations that show that these things group together in nested hierarchies with one another, with no reference whatsoever to H. sapiens. What matters as we group them together is not their distance to H. sapiens but their distance from one another in their own group that has nothing to do with ours.
This cannot be accommodated in an anthropocentric view of mutations.
Pardon me if this makes no sense; it’s quite late where I am and I’m committing the cardinal error of posting while sleep-deprived.