I agree the hierarchal structure emerged in response to perceived threats. The distinction is that this particular system was not mandated by the Apostles. We have no examples of Apostles appointing successors, or Bishops, and proclaiming that they have unique authority and power. So if you wish to argue that the leadership system that developed was of divine intervention that's an interesting topic, but you really can't claim that the leadership system was set up by the Apostles themselves.
Sure we do. St. Paul consecrated Timothy and Titus and intructed them who to concentrate in succession. St. Peter states that his office will be perpetuated throu8gh generations. I'll have the scripture tomorrow.