I don't think the David Woods who died in 1912 in Bellanagall is a red herring.
James Boyd's ( the informant at the 1912 death) parents were John Boyd and Elizabeth. Here is their 1911 census record
The maiden name of Elizabeth Boyd was Clarke which is the same as the middle name of Robert Clarke Boyd who married Sarah.
I'm sure if you check the 1895 marriage record, the father of Robert was John.
I don't know if David Woods actually left for Canada or not or if it was a ruse. Possibly he did go to Canada and was ill and returned to Ireland. Seems like you should be able to check incoming ship data in Canada.
See third record for the 1870 marriage of William Woods and Emily Buchanan. They were Church of Ireland.
Let me know what questions you have.