I'm sure the relationship here is simply the maximum and if it's the connection finder, it includes marriages anyway. We've only got a tiny fraction of the people in the world on the tree, so there can be any number of missing connections which will ultimately be here. The GEDmatch figure looks about right. You just need to check the other matches using the e-mail addresses and see if you can find the actual MRCA for the group. I've been sorting my matches by chromosome and for chromosome 6 I have group of 6 matches near the beginning, 3 at 160 million, and 2 at about 138 million as well as 4 other singles at various points. I need to start e-mailing people, but haven't gotten to it yet.