Okay, I was going to let go Fr. Gregory's comment on the other thread, but I can't. I may be completely wrong on this - I know he thinks I am - but I don't buy the reading he's giving to AC VII (see his comments under "You Do Not Have the Right To Exist" from yesterday). When it is maintained that for the true unity of the Church it is enough to agree about the doctrine of the Gospel and the administration of the sacraments, I do not think what is in view is anything less than this:
It is the Gospel and the Sacraments through which believers are formed, joined to the Son and the Father by the Spirit, and so joined to one another. "What we have heard and seen, we proclaim to you that you also may have fellowship with us, and our fellowship is with the Father and with His Son, Jesus Christ." 1 John 1.
What AC VII rejects completely is that this fellowship with the Father and the Son in the Holy Spirit wherein the unity of the Church consists are in any sense maintained by "human traditions, that is, rites or ceremonies instituted by men." Thus the quote from Eph. 4: "One Lord, one faith, one baptism, one God and Father of all." (Among such human ceremonies is the distinction between presbyter and bishop - that's much of the point of the Tractatus)
The oneness comes from the one Lord and through His means. Through them God the Holy Spirit forms and joins believers to the one and only Church, which is described in the following article as "the congregation of saints and true believers" among whom hypocrites will always be mingled in this life, but those hypocrites in either the preaching office or the congregation do NOT make of no effect the means through which Christ gathers to His one Church.
Thus, I do not think that "transparochial reality" was even in view in discussing the Church in this passage (i.e., churches in particular), but what WAS in view was Rome's contention that the Lutherans were no longer church because they no longer said the Roman canon or followed Rome's dietary laws, etc. Their response is that the Gospel and the Sacraments keep them united to the true Church because they keep them united in faith to the One Lord. And the further implication is that in Rome (and in the East) it also only the Gospel and the Sacraments which keep folks united in faith to the One Lord and so part of the One Church.
Dr. Korby long ago said it was all about authority: does the Word of God, do the Sacraments of Christ, have the authority, the inherent power, to keep the Church the Church?