I understand that there are similarities with idoma and igbo, but i think that is due to the fact they are neighbors with the boundaries. My mother and most of my family are Idoma but I dont speak fluently as I was raised in the UK but hearing the two languages they do not sound the same although some of the names use the same structure for spelling and pronunciations. If we had to pick one out of the three main tribes that we are most similar to it would be Igbo but apart from that we are different. It is not bad to be different and that doesn't mean we dont want to consider the nation as one, but sometimes people forget about the smaller tribes in Nigeria and generalize the country as a three tribe nations so it is nice for the smaller ones to have their individuality to be proud off.