How does this explain the ancient usage of the term, or St. Paul claiming being a father to those he claimed for Christ.  

As I mentioned before the term father for either a bishop or priest was used in other languages long before the baltimore catechism. 

Which brings us back to the original idea of instead of humility we assert our own interpretation above that of the collective Church. In this case a simple affectionate term that was even used by the apostle Paul for himself. 

If we look at the passage in its entirety in contains even more condemnations for calling anyone master, rabbi, instructor and so on. If we are to take the plain reading of this passage without the lense of tradition we should all become protestants, because every apostolic church has titles like those in use. 

Again in scripture Christ is not listing things randomly, but instead rallying against hypocrisy, as the people should do sit in the seat of Moses but will only speak truth instead living by it(1/2)