Cushites - are "Black" in a political sense, maybe less so in a cultural sense as I've been made to understand that Ethiopians generally don't see themselves as lowercase "b" black.
About the gradient thing, black people have a huge spectrum of different skin colors, even within the same family. My Mum for instance, is light skinned. My sister and I are quite dark. The funny thing is we started out really light skinned as children, perhaps till we each turned three. I've heard some kids start out blonde and end up with dark hair? I find it all quite interesting.
But he said that you are correct, if you go in the north of Somalia, where currently, Somaliland is. You will find that many Isaacs ( clan name) think they are descendants of the arab tribe of Mohammed. My friend tells me these people are just confused. And I think we can agree that DNA analyses seem to suggest he's correct.hehe.
DNA and linguistic research seems to suggest the Earlier Egyptian,Somali, Amhara and Eritrean populations to be close relatives. With the Somalis having the least influence of surrounding nations ( Arabs, west-africans etc.)
Funny how the ones that don't think they're purely Africans, are the ones that in fact, are!