I agree on the Emersons and Hoggs being tied together in some way, I just don't know what the connection is!
Just to recap the other established lead for my own benefit, in case I'm picking it up wrong (please let me know).
(1) Scotmum's 1947 death notice for a George Hogg said that he had a brother Walter Hogg (wife Mary) who lived at 13 Zetland Street. (BTW, Walter Hogg is far from a common forename / surname combination in Ireland).
(2) Aghadowey's 1961 Belfast burial for a Walter Scott Hogg gives his last place of residence as 13 'Letland' Street, I'm thinking, surely this just has to be a mistranscription of Zetland Street (I can't yet find a closer alternative). Also buried in the same grave is a Mary P Hogg, just the right age to be Walter's wife. The name Walter Scott Hogg is most definitely not a common name.
(3) Aghadowey's 1911 census return for Ettrick Street shows someone with that
very singular name, Walter Scott Hogg, age in line with the 1961 burial record, also in the household are a George Hogg and a William Hogg.
In those 'linked' circumstances, the immediate thought has to be that George Hogg in the 1911 Ettrick Street census return is the brother who died in 1947 and William Hogg is the brother who just possibly fathered a son William in 1937 with Violet Graham (pending confirmation of any marriage). But I can't seem to gain any traction on who the folk in house 1 Ettrick Street in 1911 were. GRONI has a Walter Hogg birth in the right timeframe, but he was the son of Francis Hogg and Mary Larmour and is easily found elsewhere in the 1911 census.
So who was the 1911 Ettrick Street Walter Hogg? And George Hogg? And William Hogg? (link again for convenience):
http://www.census.nationalarchives.ie/pages/1911/Antrim/Cromac/Ettrick_Street/159711