Not trying to get off topic, but this is why some people question the Bantu migration. Bantu groups like the Lemba from East and South Africa all say they have different origins and not from Cameroon. A lot of Bantu's from East and South Africa all have oral traditions saying they came from North Africa. A good Youtuber even told me that the Zulu have oral traditions saying they came from Egypt. Now I do not dismiss the Bantu migration, but this is something that academia should take a look at.You pretty much hit it right on the nail. Yemen plays a huge role in the history of the Lembas. According to their oral tradition, their ancestors crossed over from Yemen and migrated south.
Heck IIRC a lot of West Africans claim they come somewhere from Arabia. But here's where things get REALLY interesting(thanks goes to Egyptsearch):
http://www.ncbi.nlm.nih.gov/pubmed/10815786On the basis of a sample of 117 chromosomes, we have demonstrated the multicentric origin of the sickle mutation in Northern Oman. Three major haplotypes coexist: 52.1% Benin (typical and atypicals), 26.7% Arab-India, and 21.4% Bantu. These haplotypes are not autochthonous to Oman but originated elsewhere and arrived in Oman by gene flow. The distribution of haplotypes is in excellent agreement with the historical record, which establishes clear ancient contacts between Oman and sub-Sahara west Africa and explains the presence of the Benin haplotype;contacts with Iraq, Iran, present-day Pakistan, and India explain the presence of the Arab-India haplotype. More recent contacts with East Africa (Zanzibar/Mombasa) explain the presence of the Bantu haplotype. The pattern of the Arab-India haplotype in the populations of the Arabian peninsula reinforces the hypothesis that this particular mutation originated in the Harappa culture or in a nearby population and in addition reveals that the Sassanian Empire might have been the vehicle by which this Indo-European sickle mutation migrated (gene flow) to the present-day Arabian peninsula, including Oman.
Note they can't say its due to slavery, because it would have been BANTU haplotype and not West African BENIN Haplotype; since Bantu's were the Africans that were being sold in the Arab slave trade and not West Africans. Now where does the Benin haplotype come from?
^^^You can even see it traveling to the Nile Valley. And we have proof that a certain popular pharaoh died from it.
http://www.newscientist.com/article/dn19094-tutankhamen-killed-by-sicklecell-disease.html
Btw, are you at all familiar with the Tarikh al fattash? It actually talks about a man from Yemen (who many believe was a Jew) who went out to West Africa and helped form a community out there. Very interesting stuff indeed.
No, not familiar with it but it seems really interesting.