I grasp your expo. Thanks. Very interesting subject.
Do you know if it has been verified that modern humans have genetic material from a known source other than Neanderthal? -- homo erectus or other? Just a brief answer. I don't want to cause drift.
Got the picture. As of yet, comparisons may not be possible as you explained. Are there other methods of comparison that could preclude the contamination issues? Just a short answer when you have time.