A development from simple to complex with nested hierarchies of shared genetics could imply the path a developer followed.
What do you mean by that?
That you think it must imply evolution is due to your faith in that theory.
No. That such a pattern supports evolution theory, is not because "we say so". It is because a process like evolution
could only result in such a hierarchy.
It's how family trees work.... You inherit traits from your parents, not from your cousins.
If this hierarchy didn't exist, then evolution theory would be falsified.
But it does exist.
There is no attempt to give the impression of evolution but there is a revelation of the Creators development style.
That makes no sense.
No "developer" works like that. It is inefficient, wastefull and unecessarily complex. It also limits you in development. For example, it prevents you from "creating" a bird with hair or a mammal with feathers.
And it totally doesn't make sense in other places, like giving several species the exact same gene that is "broken" in the exact same way (GULO).
So yes, IF a "developer" would go that much out of his way to create a productline with such a distribution of shared genetics, then I can't explain it any differently then to say that this "developer" was very deviously trying to make it look as if no developer had anything to do with it and to "trick us" into believing they evolved over time.
Especially considering that this "developer" then made genetic reproduction work in such a way that we could even observe the process in real-time (reproduce and pass on genes mutate, survive, repeat).
The point you made about ERV viruses in the common history of multiple species could just as easily imply a common vulnerability to that virus because of shared genetics.
ERV's don't work like that.