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So to clarify what the SJC is saying, the BCO DOES NOT speak to the specifics of the Diaconate, it only refers that the deacons should be formed in a board.
Oh no.
The constitution says a lot more than that!
Deacons and ruling elders are qualifed, examined, ordained and installed by the same processes throughout the Book of Church Order, reflecting them as the means by which God governs the particular church.
But there is nothing prescribed about the specific formation of the Diaconate in regards to number, frequency of elections, ballot limitations, and many other things.
Be careful, e.g.
9-4. The deacons of a particular church shall be organized as a Board, of
which the pastor shall be an advisory member. The Board shall elect a
chairman and a secretary from their number and a treasurer to whom shall be
entrusted the funds for the current expenses of the church. It shall meet
separately at least once a quarter, and whenever requested by the Session.
The Board of each church shall determine the number necessary for a
quorum.
The Board shall keep a record of its proceedings, and of all funds
and their distribution, and shall submit its minutes to the Session regularly,
and at other times upon request of the Session.
It is desirable that the Session and the Board of Deacons meet in
joint session once a quarter to confer on matters of common interest.
And because Deacons are not an explicitly necessary office according to the BCO,
Not sure where you are getting this from.
3-6. The exercise of ecclesiastical power, whether joint or several, has the
divine sanction when in conformity with the statutes enacted by Christ, the
Lawgiver, and when put forth by courts or by officers appointed thereunto in
His Word.
4-1. A particular church consists of a number of professing Christians,
with their children, associated together for divine worship and godly living,
agreeable to the Scriptures, and submitting to the lawful government of
Christ's kingdom.
4-2. Its officers are its teaching and ruling elders and its deacons.
it is up to individual congregations on whether or not to ordain elders.
Surely you don't mean this-
The BCO does not permit a church without elders- not in presbyterianism!
Your statement here, "To argue that somehow "diaconate" in the BCO is an ill-defined term is beyond my ability to comprehend," is true, but not to the issue. The Deacons are clearly defined in the BCO, but the specifications of how this board functions is left up to the Church.
As 9-4 says above, it is specific in general charges and operation. "How" the Board functions, with a Treasurer and Pastor as an Advisory member is pretty specific.
The charges for Diaconate are, basically:
1) oversight of mercy ministry
2) care and use of real and personal property of the congregation
3) development of the "grace of liberality" in the congregation
These are very big, ongoing, and essential tasks in every congregation. In the rare instances where God has not called Deacons, such as a start-up church in a destitute region, all the responsibilities fall back on the Elders until Deacons can be confirmed.
This is why the number of deacons is not prescribed.
Though minimums are set for elders to particularize a church, in general there is no number of elders set- similar to Deacons.
It's really dependent on God calling and appointing, and He doesn't have an exact formula. We only know its ordinarily a plurality.
And finally, while it is true that the BCO appears to assume of plurality of deacons, the SJC proposal labels the NORD view as being a Non-Standard Practice (NSP). This means that while the BCO assumes one practice as standard, a congregation or session may choose a practice, so long as it is not explicitly prohibited.
Things are true both by being stated explicitly and implicitly.
Because the BCO explicitly constitutes the local church with elders and deacons, it implicitly excludes governance by bishops.
We wouldn't say because the BCO doesn't specifically say a church can't have bishops that a local church could govern by bishopric.
As I've noted, there are a number of examples (16 in all) that demonstrate that this is how the PCA functions. As a result, just because the BCO operates under the assumption that there will be a plurality of elders, it nowhere requires it. And furthermore, its existence is not seen as necessary (though it be preferred) in the Church. The Proposal reads directly regarding BCO 9-3 "(Granted, it says 'impossible' not 'undesirable'. Nonetheless it demonstrates the lack of necessity)"