Nothing has readily jumped out at me for James Gingle after he took off, perhaps he changed his name. But at least we know that he points back to the Kilwaughter / Larne folk.
On the Scott side, the surname can be challenging to research in this geographic context, but here are some possibilities to note until you can rule them in or out. The marriage of Margaret Scott to Samuel Livingstone in 1880 was at Lisburn, so I'm guessing that Margaret's stated residence of "Cabra" was the townland just south of there (rather than the one away down near Rathfriland). The two witnesses were Martin Rutherford and Ellen Scott, the marriage of a Martin Rutherford to an Agnes Scott (daughter of Robert a farmer) in Belfast in 1876 may indicate a possible sister to Margaret:
https://www.irishgenealogy.ie/files/civil/marriage_returns/marriages_1876/11154/8086119.pdf The same couple in 1901 and 1911 (note forenames like Ellie and Sarah Jane for the children):
https://www.census.nationalarchives.ie/pages/1901/Down/Pottinger/Castlereagh_Road/1216237/https://www.census.nationalarchives.ie/pages/1911/Down/Pottinger__part_of_/Castlereagh_Road/220450/In the 1901 Ireland census, there is an Ellen Scott in "Cabragh", living with her mother Ellen:
https://www.census.nationalarchives.ie/pages/1901/Down/Ballyworphy/Cabragh/1240519/In 1905, Ellen Scott the mother died at Cabra:
https://www.irishgenealogy.ie/files/civil/deaths_returns/deaths_1905/05582/4568031.pdfIn 1906 in Hillsborough, Ellen Scott the daughter married a John Jamison, Ellen's father was given as Robert, a farmer:
https://www.irishgenealogy.ie/files/civil/marriage_returns/marriages_1906/10134/5686939.pdfThe Jamesons in 1911 at Cabragh:
https://www.census.nationalarchives.ie/pages/1911/Down/Ballyworphy/Cabragh/249629/When Margaret Scott Livingstone married James Gingle in 1889, one of the witnesses was a Sarah J Bell. When a Sarah Jane Scott married John Bell at Lisburn in 1874, her residence was given as Cabra and her father as Robert, a farmer, one of the witnesses was an Agnes Scott (maybe the same one who married Martin Rutherford in 1876?):
https://www.irishgenealogy.ie/files/civil/marriage_returns/marriages_1874/11226/8115444.pdfSo did the Margaret Scott (a.k.a. "Elenor" if the 1901 Ireland Census return for house 8 in Ardgowan Street is to be believed) who married James Gingle have sisters Agnes, Ellen and Sarah Jane? If her father was Robert a farmer, was her mother named Ellen (as per that 1901 Ireland Census return for Cabragh)? Also note the following marriage in 1846 (Ellen and Eleanor being interchangeable), it took place at Lisburn, it was for Robert Scott, a farmer, of Ballymurphy (west Belfast) to Eleanor Waterworth of Cabra:
https://www.irishgenealogy.ie/files/civil/marriage_returns/marriages_1846/09312/5371909.pdfAll just possibilities for now.