There's one wave that provided 98% of the genes in modern humans outside Africa. Probably a single traveling group that represents a historical choke-point in the gene pool.

yeah, i doubt the thesis. The egyptians certainly left africa in several waves, and it's unbelievable that there wasn't genetic mixing between egypt and subsaharan africa.

What are exactly egyptians in your case? Much of the mediterranean basin including modern Turkey, Syria, Lebanon, Israel/Palestine, Egypt, and the rest of N. Africa was also settled by "Europeans". Egypt itself went through multiple periods including Persian, Canaanite, and Hellenic periods. Overall you need to be very specific of the period because there was a lot of influx and movement of people and civilizations.

Even in the past 2000 years there were huge demographic changes in Egypt, the Egyptians today are not an entirely good representation of Egypt even 2000 years ago during the Coptic period.

The changes in skin tone, physique and facial characteristics in Egyptian art are quite interesting to see and they represent the changes in the ethnic and demographic makeup of the civilization.

For example late period mummies and portraits show the outcome of genetic influx from Hellenic and Roman cultures into Egypt https://en.wikipedia.org/wiki/Fayum_mummy_portraits, this is even more interesting since Faiyum is quite far from the coast line which shows that demographic changes spanned the geography of egypt.

so, basically you made my point for me.