there is also an Abu Bakr Efendi who was sent to South Africa by the Ottamans way back under british rule. he was sent to assist the british in religious matters because of trouble between the shafis & hanafis. this family is similar to ba Alawi family who also have thousands of ulama in this present day. you always find a few of them in the top ranking ulama of the world especialy in the shafi madhab. they took islam to 1/3 of the total muslim population & like you said a chain of scholarship from father to son since the nubuwa of Rasulullah SAWS as they are also ahlul bayt.
Yet, Islam isnt that much spead in the southern Africa like Christianity You guys need to do daawa in Lesotho, Swaziland, Zimbabwe, Botswana, Angola and Namibia The last generation did their job its up to you to win the hearts and minds of African hinterland where Christians dared to go