Ifa is not the only divination system built on sixteen four-position figures. Fa, practised among the Fon in what is now Benin, uses the same architecture. The sixteen cowrie oracle of Yoruba practice and its Cuban descendant share much of the same vocabulary of names. Sikidy in Madagascar and the Comoros works on comparable lines, and so does ilm al-raml, the Arabic geomancy that also reached medieval Europe as geomancy proper. Sixteen figures, generated by four binary decisions, recur across a very wide area.
How these systems are related is a genuinely open scholarly question, and the atlas records it as one rather than picking a side. Some scholars have read the African systems as local developments of Islamic geomancy transmitted across the Sahara. Others argue for independent or substantially independent development, and point to features of Ifa that have no counterpart in the geomantic tradition. The chronology is thin in both directions, and the evidence that would settle it, early datable material rather than late testimony, is largely absent.
Osa Meji is the tenth of the sixteen principal figures in the published sequence, one instance of that widely shared architecture as the Yoruba tradition uses it.
The comparative question is about structures. What Osa Meji says in a reading belongs to initiated practice and is not reproduced here.