Need to upload to GEDMatch; One thing leads to another

Helen popped up in my Ancestry DNA matches, with sufficient of her tree attached for me to believe that the DNA match could be accounted for by our believed to be shared Peter SINTON and Jeanie WIGHT who married at Southdean, Roxburghshire in 1806.  See #1.

Thanks to that bit of activity on an update on the family of Peter and Jeanie's daughter Margaret (I hadn't followed Margaret's grandson John down beyond the 1881 census until now, so Helen was a very pleasant surprise) I took another look around some of the rest of Peter and Jeanie's family - who don't appear often in baptism records.
Which led me to review the family of Elspeth/Euphemia SINTON who married Robert SLATER/SLATTER/SCLAITER/SCLATTER, fisherman of Lessudden.
An 1855 birth cert. of a son Thomas had helpfully indicated that their eldest son James, born about 1845 was still alive in 1855 but I'd never found hide nor hair of him beyond the 1861 census.
Mind you it was quite some years ago since I'd looked. So many more online records these days!
Still couldn't find him obvious in any Scottish census records, nor those further afield easily available on Ancestry.
So I turned my attention to the children of his brother Robert.
Popping Elspeth Sinton SLATER into a census search to find her beyond the 1891 I already had wasn't any more successful this time - but did result in an entry in the National Probate Index in 1926 in London with the surprising information that she died, single, in Dublin.
What's more, the administration was granted to one James SLATER, retired engineer.
Surely that was going to be her uncle? Missing in action beyond 1861?
Who has now subsequently been found in the 1911 census in Dublin North at the same address as Elspeth's normal residence at the time of her death.
James was shown as a widower, marine engineer born Scotland, religion Free Church of Scotland.
In the household was an unmarried sister-in-law Mary MILLS, also born Scotland, Free Church.
Which was enough to find James' marriage to Jessie MILLS in Hawick in 1869 - usual residence for James was already Dublin, occupation engine fitter.
Next mission, find out if James and Jessie had any children.

#1: the dangers of Ancestry DNA and their refusal to supply a chromosome browser.
Thankfully Helen did upload to GEDMatch where the actual DNA match details could be compared.
The relationship between Margaret (married Robert AINSLIE) to Peter and Jeanie (WIGHT) SINTON has yet to be proven by DNA as at 4C1R we didn't get the luck of the draw for a provable segment of shared SINTON/WIGHT DNA.
The larger of our two segments turns out to be a longer ago bit of DNA and somewhere back up a different line of my ancestry - this one:
http://surnames.lornahen.com/tng/lh/dnagrp17p036.php
and an unknown line of Helen's. 
The smaller bit, at only 7cM, is too small, untriangulated with anything else as yet, so inconclusive as to ancestry.