I think I should probably give up on this before I end up doing more harm than good.
As part of the Connectors Project, I've been putting up lists of the largest unconnected branches in various countries on the Connectors Chat page. (And a big shout out to Aleš for giving me the reports of unconnected branches by size.)
I also have a list of "Challenging Unconnected Branches", which are going to be tough to connect for various reasons.
One branch struck me as well-nigh impossible, because none of the profiles have any dates (birth, marriage, or death), place names, or even first names (only first initials). Also, all the women were listed by their married names rather than their maiden names, and most of their husbands were not listed at all. Basically, I couldn't see how anybody could be expected to make sense out of that mess, so I decided to try and see if I couldn't give anybody willing to take on that job a few hints.
I contacted the WikiTreer who uploaded the GEDCOM that those profiles came from, and he couldn't help me out, because it turns out that somebody had added all those profiles to his tree on another genealogy site without his knowledge, and when he transferred his family tree over to WikiTree, he was asking, "Who are all these people?"
So I did some poking around, and some creative searches on FamilySearch (looking for a woman with this first initial, that maiden name, married to a husband with that last name, with a daughter with this first initial who married a man with that last name. And I hit pay dirt: I got first names, dates, and places, and as far out as I've traced, the last names and first initials match (although there are a bunch people who weren't in the branch as I found it). So I'm pretty sure I've identified the right people, unless I've just tripped over a really unlikely coincidence. (Oh, and it's possible that this branch bears some relation to Abraham Lincoln through his aunt Nancy Lincoln, who married a William Brumfield.)
I even managed to link this branch to the main tree, just by chasing out one of those unlisted husbands.
So, it's all good, right?