Erica Howton, there are pages and pages and pages of Armstrong marriages in Ireland near Fermanagh. They cannot be all from one family because there are many many contemporaneous duplicates as well. This is, in part, why I haven't tackled building Armstrong families from the Clogher records - I generally can succeed at that only when there are a small number of families involved and the children can be naturally associated by naming and dates.
Pretty much all web trees for Cynthia's "James" claim County Fermanagh as his place of origin, and there is absolutely no lack of Armstrong families he could have come from there, so there is no good reason to doubt that claim. The problem is that the pedigree we have for Fermanagh Armstrongs cannot be complete. It simply cannot, given the number of families that are represented in the records which we have no idea how they fit in.
*Some* families are pretty complete - the ones who emigrated and brought all their children. The ones in Ireland were built from patchy records though and we must accept those will have children that aren't mentioned in the pedigrees. There is one whole branch that isn't mentioned at all, in fact, that seems to have generated many of the Clogher-area cousin marriages. I currently have a start at this hung off of William son of Edward of Terwhinney, because naming conventions suggests William was the patriarch's given name. Many of the non-pedigree Armstrongs could have come from that branch, but due to its distance to MY branch, the closer DNA matches cannot - they'd be 9th+ cousins given that and the DNA at that level is fraught. So I am personally trying to list DNA matches descended from immediate relatives of John Joseph that I've hooked in over the last three years based on DNA evidence. These hook-ins might move if there were nearby parental options available, but until then they are more likely correct than not.
For Cynthia's James, though, I have zero evidence of a DNA relationship, so I believe her James likely came from that branch. If I know his family members' names, I can take a guess at his placement.
So what I propose is that we validate the *core* tree and try not to peel off children that aren't in the pedigree, unless they aren't there for DNA reasons, or we have evidence they belong elsewhere. Just note in the About section about why they are where they are. (Generally, I have already done this but I will go back and make sure of it.)