I think E-V13 has very more chances to be born in Europe than in North-Africa, even if his ancestors came almost surely from North East Africa. In the today hotspot big region for Y-E-V13, the most variance for Y-E1b (but almost all of them V13) are on the coasts of Dalmatia = maritime Croatia, even if the frequence hotspots are in Kosovo, Greece, Albania, and a bit less dense, in Macedonia, Serbia, Serbians of Bosnia, Bulgaria and East Romania.
I thought some times ago Y-E-V13 had made its road along with Y-G2a during the Neolithic advance. Now I'm less sure concerning dates. Maybe its change of gravity center in Balkans is linked to Chalcolithic/Bronze Ages under a Y-J2 launching. Its destiny could have been there linked to the Y-J2 (+ some local Y-I2a1b and some Y-G2a) expansion in the frame of later Cucuteni-Tripolye expansion until Southern Belarus. evidently the later steppic I-Ean and Slavic developments have erased this (supposed by myself) first colonization in Northern lands!
hypothesis upon the today data I have. So, don't disagree totally with you. Y-E1b-V13 could have had a complicated story.
I agree, and this is how I see it in detail.
All modern Y haplogourps since Neolithic had spread around only as farmers and herders. There were no pure hunter gatherers that could spread so successfully since Neolithic, especially into farmers territory. First they needed to meet farmers, mix with them, acquire their successful farmer genes or transfer their Y chromosome, and only then could explode as successful Y haplogroup. Even IE herders (R1) needed to acquire farmer (Armenian like) genes to build up numbers and then expend/conquer.
Let's say that Natufians/fertile crescent first farmers were G2a folks. This means that only G2a carrying farmers were expanding first all over Near East and South Europe. When they were expending they met and assimilated Y haplogroups of local hunter gatherers. Only after this assimilation and giving local Y hg set of farmer genes and culture, these new Y hg could also expend by over-breeding and farther expansion in HGs territory.
This means that we should find G2a mostly, sometimes only, in very Early Neolithic sites, before others were assimilated and turned into farmers. They were like Borg from Star Trek, lol. Resistance was futile.
I'm sure there had to be more haplogroups than G2a in Fertile Crescent. Perhaps G2a expended initially so fast that didn't have time to interact much with H-Gs, and carrying them into Europe? However, from recent research we learned that Y haplogroups really compete with each other (on genetic) level and every couple of thousand of years old haplogroups go extinct and new explode, even if genetic base (autosomal) stays fairly unchanged. On average we still carry about 50% of first farmers genetic material, however their Y chromosome G2a is almost extinct these days. It is counter intuitive, and makes disyphering haplogroups of original populations rather difficult.
Maybe G2a was rather "weak" comparable to other Y hgs? Maybe it made men too peaceful, or a sexual, or something else? Whenever it met other haplogroups it was losing the battle. It had met I2, R1b or J2 and after couple of thousand of years populations turned into almost exclusively I2, R1b or J2.
Isn't Hungarian Neolithic telling us this story? Instead of finding mostly G2a among farmers we find I2, F and C, the local hunter gatherer haplogroups among farmers. However atosomally they were still 90% ENF.