All your points are good. And the takeaway point is that whatever child born in Kenya officially the child of the Kenyan 0bama is Kezia’s by another man, and is of no relevance!
Another dead end just in case anyone thinks it isn’t... There have been threads about “oh look, a child of the Kenyan in the Kenyan archives born in 1961 in Kenya”. etc.
And everyone jumped onto the wagon, no one thought to ask themselves, when was the Peter Firstbrook book published, is it possible someone who read it picked up that bit about Kezia having a child while the kenyan was in Hawaii? No. Apparently it was far more exciting to suggest Stanley Ann Dunham went to Kenya to have a child. Rubbish.
Until people let go of that mother-myth, and realize the reason no one saw her in Hawaii or saw her pregnant was simply because she wasn't either...they'll find nothing.