Nigeria was granted independent in 1960 by Britain, ever since she has been playing a fatherly role in the African continent, some of the roles include laying a solid foundation for the establishment of ECOWAS with her continent sister Togo, she also played a lead role in peace keeping missions in Africa . Also to mention is the supply of electricity to neighbouring countries, to mention but a few with these one can conclude by saying Nigeria is truly a blessing to Africa.
Yes Nigeria is a blessed nation and a giant of Africa as it maybe called. They've numerous natural resources and human resources with a strong geopolitical background.
Just as you said, they've been playing crucial roles of assisting the neighboring countries within the Africa continent with most provisional supports but the fact is that the government of Nigeria is not utilizing those resources to an utmost benefit of her citizens.
There had been adjective poverty poverty in the country to the extend that her citizens even relocates to the neighbor countries which are even less resourceful than Nigeria but their at the admired neighboring country(s) has more of governments concerns for their citizens than Nigeria which has more potentials does to their citizens.
Citizens of Nigeria relocates to the neighboring countries with less resource compared to Nigeria because Nigeria lacks the structures to build infrastructures even that would attract foreign investors simply because of selfish interests in the governance system.