He was likely interviewed in both papers. What's more important, IMO, is that the Honolulu Advertiser actually checked their archives, and affirmed that Obama Sr. graduated in 1962. The internet is littered with articles that state he graduated in 1963 -- based, I guess, on 1959+4=1963. It gives you a good idea of the what passes for journalism nowadays.
The address listed in the birth announcement is over 7 miles away from the University of Hawaii while the Atherton YMCA and St Louis Heights are both within one mile of the University.
I'm not sure the address in the Honolulu Advertiser birth notice is important, since even Obama doesn't try to argue that Obama, Sr. and Ann ever established a home together. It's probably the address of the Dunham grandparents at the time.
I think Spunky found property records of that address. I don't think it was the grandparents.
Stanley and Madelyn Dunham lived in “a modest wooden house on University Avenue near Kamanele Park”(The Honolulu Advertiser as linked above) near the University of Hawaii at Manoa before moving to a Beretania St. apartment where Barack lived with them and where Madelyn lives to this day. All the addresses are within close proximity of the University with the exception of the address listed on the ‘birth announcement’.
Reason the published address will prove out to be important is because it will furnish a source of information. I suspect your speculation that it was the Dunham address is correct. And maybe no one was around that address in the relevant period.
But if Ann was not there until mid August and then showed up, that would be interesting--where was she before then. And you can search title on the adjoining or neighbor houses to look for witnesses who may have knowledge about where he was born. You only need to find one or two neighbors who have first hand knowledge to reconstruct the events around the birth and bring the house of cards down.