While it's true that we don't know who Jehovah was using during the 14th century, it's also true that we don't know whether Job the greatest of the Orientals of his time had any contemporaries. So who and where was God's Organization during certain periods of time is really not an important question.
Priceless. Must be the good ol' Watchtower logic. Basically what he is saying is this:
We know that the Watchtower organization is God's organization because God has always used an organization. Now, we have no idea who the organization was, prior to ours, and that is not important at all. What's important is to know that the Watchtower society is the true organization because evidence shows that God always used an organization.
Circular reasoning never sounded so good folks!