That logic does not work, i showed up 74.5% somali but i look typical somali. I would say if you are about 30% foreign ancestory it should be noticeable.5% or less Bantu heritage would be difficult to notice from the phenotype. A white man who is 5% subsaharan african would still look white, the same applied to a somali. I think 20% or more Bantu admixture could be noticable from the phenotype, but anything less than that would still fit in the average Somali phenotype