The Bioko hypothesis uses the model of punctuated evolution, with speciation (rapid evolution) followed by stasis (minimal evolutionary change).
Arboreal orangutans speciated about 20.2 million years ago in SE Asia and evolved rapidly there. They have not changed much since.
Arboreal gorillas speciated about 15.8 million years ago in Africa and evolved rapidly there. They have not changed much since.
Arboreal chimpanzees speciated about 9.2 million years ago in Africa and evolved rapidly there. They have not changed much since.

Some chimpanzees became isolated on Bioko Island about 6.6 million years ago, where there was no arboreal habitat. They became marine. Within about the first million years, these marine apes probably evolved into marine humans, with advanced language but no clothes, tools, weapons, or fire.

Some humans (Erectus, Denisovan, Neanderthal, Sapiens) migrated from Bioko to the mainland. They invented clothes, tools, weapons, and fire, and some left some fossils. But most humans remained on Bioko until about 70,000-50,000 years ago. At that time they all left, and a wave of humans rapidly populated the entire world migrating along continental margins, which are now submerged because of the present high sea level. 



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BiokoApes.com