It‘s also possible that the breeding in Fasano was not allowed by the EEP. While Nasibu is obviously not genetically identic with his brothers, I find it hard to believe that he has a breeding recommendation.
Is it Nasibu who lived in Sweden (Kolmården) for a while in his youth? If so, does anyone have information regarding if it ever was established that it actually was the then silverback Efata who sired the babies Enzo and Ecco? I would not be surprised bearing in mind how long it otherwise would have took for Efata to breed Naomi. Or was it so that the plan with the introduction of a rival lighted the spark?