Something may have changed with a massively common ancestor, or a person further back in time. A few months ago, I had to untangle an incorrect husband and wife pair from early Pennsylvania because there had been a bad merge between two couples of different time periods but with the same names. (The result was a woman born in the 1720s married to a man born in the 1780s, resulting in children born between 1740 and 1820). They were about 15 steps from AJ, and it blew out a bunch of connections! So, they weren't too close to AJ, but a lot of people were close-ish to the mess. But once things were re-sorted, everyone ended up back where they were supposed to be, or closer to AJ.