That is not true about the origin of Ogume and mind you the names you mentioned about Ogbagu Ogume does not represent the facts... Ogwezi Olodu is the founder of Ogbagu and also the first settlers and nothing like Okpala Olodu, and you can find out more from other quarters in Ogume..
They is God in Ogume known and called Chi osa Ogume(meaning the GOD of the 7 quarters of Ogume)and is only hold and served by the Ogwezi Olodu as the founder of Ogbagu and the most senior among them that migrate from bini.
I believe this research methodology is based more hear say than the reality on ground and I doubt if the researcher has visited Ogume for his entire life.