Your right you do have historical records that some churches had bishops. However, your argument falls in that they do not say they were appointed by the Apostles. Also, you find most churches were run by leaders appointed by the congregation. For example, Clement was upset with Corinth because they had removed leaders he liked and installed others they felt were more appropriate.
John does not refer to himself as a Bishop, but as an elder towards the end of his life.
The only way you can make a claim to a special nature to the succession of your church leadership would be in the ordination process, or laying on of hands. Your claim falls if it's based on Apostles appointing leaders because they did not do that.
We know some of them had met the apostles, we know the apostles name bishops, no where do we see the apostles speak against bishops.
I just gave you scriptural references.