Is your position that ONLY the "20th" levels exist today, and is that actually so?<quoted text>
To repeat the point.
IF there had been a recent flood bottleneck and IF haptypes had proliferated from there at an amazingly rapid rate, we would observe all (or most) of the 20 levels of the hap tree in populations today. Then you could talk about co-existence, not replacement.
But we don't.
We see the latest levels only. Not levels 1, 2, 3, 4 etc, only level 20 and 19. Because the earlier ones HAVE been replaced.
Not because I say so, but because they cannot be found in human populations. If the flood was recent, then the older levels would not only exist, they would be the most common so if they are there they should easily have been found.
Starting to follow the logic?
I grant you this. If the entire genome is taken as a whole, then no genome from 4500 years ago probably still exists, although it is not impossible, is it?