Does ministry ever exist in the abstract?

I was recently given a first edition of Walther's "Die Stimme unserer Kirche in der Frage von Kirche und Amt." I began reading through the theses on the ministry and noticed a glaring omission. Under the testimonies of the confessions for the second thesis there was no discussion of whether the Predigtamt refered to in AC V is in abstracto or in concreto. That this distinction is fundamental for Walther's case against Grabau is evident in the fact that he gives this attention in later editions. http://books.google.com/books?id=2XQrAAAAYAAJ&printsec=frontcover&dq=die+Stimme+unserer+Kirche+in+der+Frage#v=onepage&q=&f=false

While the distinction helps make an effective point against the claim that there can be no congregation of the faithful without a pastor, the distinction is unfortunate. It is certainly Platonic. How can one have a leibliches Wort without a Leib? Ministry never happens in the abstract. That it happens at all requires that it be concrete. Someone must be speaking. So, while we cannot say that there can be no congregation without a pastor, we ought to take it seriously as a possiblity. I think we can say, "Where there are no pastors for long, there will be no congregation." There is an urgency here.