Your assumption of open set, sets up your means of analysis.
True, but I don’t see how ‘open-set’ is an assumption. ‘Closed set’ is an assumption, and a very strong one at that. But ‘open-set’ is simply doing away with that assumption. And from work with the Hamilton texts, it appears that allowing the candidate set to be open results in very little loss of author-identification power even the set of candidates really is closed.
The Spaldingites assume closed set, while acknowledging that there are other possible authors available.
I don’t see how assuming a closed set, but acknowledging that the set might be open, helps anything. The damage is done by assuming a closed set.
The Stanford study lined up fairly well with Dale's previous results. It substantiated partial Spalding authorship in approximately the same textual units where Broadhurst's study predicted they would be found. We will see.
But as you can see from the PCA plots, Spalding’s authorship features are very different from all but 1 or 2 of the Book of Mormon chapters. There is no meaning in the Stanford study’s attributions. I fully agree that we will see.