I am also interested with regard to the point Jonathan raises here, but it is stated above to be a "small but excellent treatise on the reunion with Glanton." However, considering internal evidence, it might rather concern other "reunions" so-called.
As said elsewhere, just about everybody in each of the various fragments of "brethren" believes themselves to be in the right. How do they know this? Because their leaders tell them so. Hence, in terms of personal conviction, one reason for the claim that "very few in the meeting knew why they were where they were."
Sadly, the "Reunited group" then went about redividing from 1997 to about 2002 - little more, that is, than a couple of decades after 1974.
I am not happy with the concept of reunions per se simply for convenience sake, and we are at the point where many companies are simply ceasing to exist.
Matthew 18 verse 20 remains a resource, but even so, quite a number of brethren now find themselves locally isolated.
That which Ezra did in his day comes to mind, viz., 'Afflict ourselves before our God, to seek of Him a right way for us, and for our little ones, and for all our substance' (Ezra 8 verse 21).