Thanks a lot, Chris!
Here is one example: Gilmore-597
This is my great-great grandmother and was in the GEDCOM file I imported. I would have expected all of her ancestors to link after I did a merge.
I'm not sure why they were skipped. They should have been included.
I'm wondering now if maybe some of the data in the imported GEDCOM file was simply insifficient. This person, for example - Powers-1193 - isn't really linked to anyone. Maybe I get another GEDCOM file that includes more info on these people and import that?