The point of not calling another man father is to not raise a brother up above another. Calling another brother pastor if it is in anyway raising him up above, or setting him apart is not right.
Objective verification from other Christians? Do you truly know how many different understanding of what Jesus taught there are? Who can give an objective verification other then Jesus?
I hung around with a number of Catholic priests, went golfing, drinking, and parting with, and there was very little agreement between them, about what Jesus taught. Now if someone officially asked them what a Catholic was supposed to believe, then most of them would give the official Catholic teachings.
One priest that I was very close to, and helped teach his adult information classes, once told me Jesus never did any miracles, nor was there truly a Holy Spirit. He said that the apostles used Holy Spirit to explain events they did not understand. Now I told him he was wrong, but he did not care if I believed him or not.
Just to let you know, I personally went to four different Catholic bishops with my witness, and not one believed me to be wrong. I was told to go do what Jesus told me to do. One bishop told me that his job was to administer the Church, and I was to do as Jesus tells me to do.