I haven't worked out who these Douglas people are? A different Gabriel to Gabriel 1784? See below  

This looks to be Gabriel in the 1841 census. I'll list as is showing on FreeCen rather than the other index.  Everyone showing as born in the county:
Gabriel Douglass 55, inn keeper,
Jane Douglass    45
Richard Douglass 25, Independent
Ann Douglass    5
Marry Gerran    25, servant
James Gibb    20, printer
Margt Nouat    10
Marry Nouat    15
Marry Wallace    15, servant
John Anderson    20, coachman
Address: Tempelhill, Dundonald Ayrshire