There were no mansa in igboland, so who where the Igbos reporting to?
You real life have a cartoon idea of Africa, you can't fathom that life developed different from how Europeans developed. You take these European style hierarchies and just draw false links between groups and rulers.
And you almost get the point, a chief is closer to a nobleman, but in his village they look at him like a "mayor/king", can't say king because they weren't always ordained. They usually just worked their way to that position.
Those are the guys you were calling kings, in majority of west Africa.
First of all the Igbo people were a forest belt people that lived no where near Mali or Mande people. From what I have been able to gather the Igbo had a Kingdom called Nri, however from what I have also been able to determine they were not a unified kingdom. So they clearly had a king. I don't know what they called their king, but that is something for you to ask them.
Second of all your supposed knowledge of Africa is straight up comical. At first I thought that you were trolling, but the more that you posted the more that I realized that you really don't know anything about West African people and their empires. The fact that you don't know that a Chief is not a King is just all levels of stupid. I have never known anyone to confuse a chief with a King and Africans definitely would have never confused the two, because that shyt would have been a death sentence for a Chief and possible enslavement for his people; if a King thought that the Chief was undermining the Kingdom. Are you unaware that Kings in West Africa had massive standing armies?