I'm not disputing that. The groups that formed what is Nigerian OC today, were oil business executives. The average Nigerian in America has at least one degree, so I'm sure the founders of Nigerian OC held MBAs and Doctorates.

This would influence the nature and scope of the crimes that the syndicates would get involved in.

As was also pointed out in this thread, Nigerians have a lot of cultural influence over people from other parts of Africa. Technically they would have a presence in every country where there are large groups of Africans. And their influence would be greater than their numbers.