The world has advanced beyond the level of trying to prove a point with just a single fact. You see, my fellow nairanders, every tribe emanated from a source and a single source eventually. You can be anything you want regardless of your cultural affiliation. Please observe these:
- Spain and Portugal were formally Iberian peninsula ruled by a single king but later fragmented into what they are today. So are Spanish Portuguese or vice versa? Answer, no. They have chosen thier identity so it is.

-Austrians speak German but deny to be German. Any qualms, no.

- The part of Delta that speaks Igbo believe they are not igbo, should there be any worry? No

Let's stop here. Even if the itsekiris are born by a Yoruba man but claim a different identity, what problem do you have with that? Stop all the confusion and understand that humanity is one but our ideologies and perception of our self distinguishes us.
Or should I also remind you that a man named Abraham/Ibrahim had two sons that claimed distinct identity, Arabs and Jews. So Itsekiris are not Bini or whatever you think they are. They are what they claim. Thank you