Has DNA testing come up trumps?

Early days yet, but indications are that we may be on the way to proving that Robert FAIRBAIRN,  married to Kate SCOTT and emigrated to Ontario around 1827/8 is indeed a son of Archibald and Alison (CROSSER) FAIRBAIRN.
One of my closer previously unknown DNA matches appears on a segment of dna that I share with a known double cousin (4C1R and 5th, as he descends from both James and from David, sons of Archibald and Alison).
"Do you have any known FAIRBAIRN ancestry" I asked.
"Yes, a Mary Catherine FAIRBAIRN married to Peter Nelson KELLER."
Now I just happen to know that Mary is Robert's granddaughter.

Although I don't yet know how my match links to Mary, or whether there's another line in her ancestry that could account for this match, I'm pleasantly hopeful we're finally on our way to proving my long held theory about Robert being "family".
Updates on Mary's family will now ensue.
Confirmation may shortly be forthcoming as the kit from another descendant of Robert & Kate's is en route back to the lab.
It would still be great to find a direct male line FAIRBAIRN descendant of Robert's willing to do a y_DNA test to quickly and more easily prove this link though!

11th: Ontario bits and bobs

Stumbled across Brant's forest with its two lone FAIRBAIRNs that looked a bit familiar.
And so it proved, and provided a wonderful new contact, Jim, with his local knowledge of the Napanee/Lennox & Addington area. (He has a connection to Peter Nelson KELLER, whom I've just found married to Mary Catherine FAIRBAIRN.)

All of which spurred me on to seeing how many of my Ontario relations and connections might be able to be found in the 1861 census now that it is more readily available.
Could take me a while, after a couple of days I'd only winnowed the list down to some 630, and I'm always prone to being sidetracked.