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All of the details on his service record information look correct except his age but men often gave the incorrect age if eager to enlist. Interesting that he was discharged as he wasn't tall enough ( 4' 9" ) and wasn't of "Sufficient physique !!!

The obituary in 1940 also looks correct, he was living with his Sister, Mrs. Elizabeth at Greenside in 1939, see 1939 Register.

It's the time he was in New Zealand that is puzzling.

With the two threads running the dates of the times he was in NZ are getting quite confused. 

Could you please let us have the dates ie BDM as you know them and then include the dates he was in NZ.  Clearly he was here in NZ to enlist, then possibly on the roll at Waimarino NZ in 1925.   

Here in NZ we have a wonderful facility called Papers Past which has searchable links to newspapers.

https://paperspast.natlib.govt.nz/

I do know that around Waimarino in the 1910s/1920s the railways were big time and also forests were being felled and railed out.  My grandfather was a clerk at  timber felling firm around Oio around this time.

You will find the McKinney Stud book and marriage records to download here:
https://www.irishantiquarianbook.com/category/all-products
Photographs of a number of the families, taken by McKinney, can be viewed online as the Dundee collection here:
https://collections.nationalmuseumsni.org/results

Just a note that the site given to download is actually a purchase and then the ability to download.  I cannot see a way to check if an ancestor appears on any of these books without buying. 

Please let me know if I am incorrect, I hope I am as I am fiendish checker of names in any 'Irish' database I can find.  Many of my lot were Scots-Irish dating back to the Plantation days and many were Presbyterian.

Note that on the 1901 census that Kiltaglassan has found there is a William Keog listed aged 60 with the status of cousin to the head of family John McIlboy. 

Keogh is one spelling of that name and if the surname Keogh is not one you have come across you will have lots of fun working out where the Keoghs fit in if you did not know before. 

NB the word 'cousin' back then was not always used for the relatives we would call cousins nowadays. Sometimes the connection was back in the mists of time........but people knew 'these people are related to us' 

On which side of the family?

Did this happen recently or has it been going on for some time?  I'm assuming some time as it it must be at least at parental level...strange that they did not seem to notice that their son had morphed or co-existed as their sibling esp one of a different sex. 

If you belong in a family where aunts are prime targets for being godmothers .....how does that work?  Are you your own godparent as well? 

Has it got some thing to do with an NPE?
'In genetics, a non-paternity event (also known as misattributed paternity, not parent expected, or NPE) occurs when an individual's presumed father is not in fact their biological father.'

All the best in working your way out of that.   

Yours in silliness
Shanreagh!