http://www.vocabulary.com/dictionary/progenitor While any ancestor can be aprogenitor, or previous member of a family line, the word is usually applied to someone who was an originator of or major contributor to the characteristics of that line.
The word progenitor can be traced to the Latin prōgignere, which means "to beget," and so is linked to the beginning of a genealogical line. The clue comes in the "gen" part, meaning "birth, procreation," and signifying the genetic contribution of an ancestor to a family line. Prō- means "forward," and the -tor suffix indicates someone doing an action — so a progenitor is someone who gives rise to a family line.
There must be hundreds if not thousands of slaves and free blacks who had children, who not being of the Christian faith were never recorded and it is unknown as in the case of the incarcerated Prince of Ternate which, if any of his descendants lived, remained in South Africa (they might have opted for going to Ternate after manumission if they were related to the royal family there) and had children resulting in a South African family line?
I think the same rule must apply to all - so the question is, is it practice in Geni to enter every person who had a child in the Cape as SV/PROG even if there is no evidence of a line of descent beyond such a first generation, or do we enter them as SV/PROG only once evidence is found of a family line having been sired?
In my opinion we should do with the Prince whatever we do with all the other thousands of people who had children born in the early Cape, but without evidence of a family line having continued beyond that.