Gary Brecher's article was, as you put it, "fairly objective". But he made some howlers that need to be mentioned.
1. The Niger Delta was never a part of Iboland, whether before or after the civil war.
2. The minorities of the old Eastern Region struggled even under the Ibos in the quest for self-government. The COR (Calabar-Ogoja-Rivers) Movement was all about the struggle of the minorities to dislodge the stranglehold of the Ibos in the region.
3. The British did not fly for NAF. Britain actually sat on the fence, at least as seen on the surface. Nigeria's western friends turned their back, which opened the way for the Eastern bloc to supply the warplanes and ammunitions Nigeria used for the war.