You cannot create constant electrical power without first acquiring the necessary brain power. With a population of 800 million, Africa does not need muscle power. First, money outside Africa cannot be used to develop Africa. Second, money outside Africa cannot be taxed. Third, it is the poor people in Africa that indirectly pay for the external debts.
Capital flight increases the level of corruption.
The flight of capital means that police officers cannot be adequately paid and are forced to extract bribes. Medical doctors, teachers and government clerks extort bribes from citizens. Capital flight is related to lack of technological development. Because it lacks the technological knowledge, Nigeria exports crude petroleum only to re-import refined petroleum. It exports steel only to re-import cars.