Playing this hypothetical out, SADO may have found that life for a white wife of a native Kenyan in tribal UK Colonial Kenya was not as romantic as it had appeared in her imagination, and perhaps she found out about Kezia as well.
Perhaps SADO bolted back to the US shortly after Obama II was born in Mombasa. But she perhaps had been told and understood that it would be highly damaging to BHO Sr and his sponsoring literacy foundation for her to appear back in HI with baby Barack. So perhaps the foundation and her parents arranged for her to return not to HI but to WA where she and her family had friends and she could resume her schooling until BHO Sr was safely out of HI with his degree. And then when BHO Sr leaves HI in 1962 she almost immediately returns to HI! Dovetails nicely, I think.
ping
The only part that does not sound credible to me is her going to Kenya by herself with O Sr. If the scenario happened as you describe, perhaps he would have accompanied her, stayed a while and then returned to HI?
From everything I’ve read over the last two years, I think it more likely than not that 0thugga was born in Mombasa.