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As well as the Barmouth war memorial, D Oswald Davies is also commemorated in Dolgellau where he had a solicitor's practice in Queens Square (Llys Owain) in the building which now houses Y Sospan restaurant. As Lt. Davies he led a contingent of 50 Dolgellau men of the 7th Battalion RWF to their HQ in Newtown on 6 August 1914. He was promoted within a month.
I believe he played one game for Wales in 1890, a 5-0 loss to Scotland. The scoreline might explain why he was a 'one cap wonder'.
His father, Rev David Milton Davies a Congregational minister, was a leading light of the movement to disestablish the Anglican church in Wales until his death at a young age. The young DOD was educated at the Congregational School in Lewisham London - a boarding school for the sons of Congregational ministers. Who knew such an establishment would exist?
I have looked for his headstone in Llanaber, in vain. Perhaps soon it will become more obvious.

Child of Isac Peat who was buried of Cae'nymynydd he was buried alongside David Francis Llyfriniog with his head towards the Argoed headstone (under one year old)

Cae'nymynydd, Llyfriniog and Argoed would be place/farm names.

Try the Llangollen Advertiser on https://papuraunewydd.llyfrgell.cymru. At least 3 John Roberts's mentioned. One from Berwyn St serving in  15th London Rifles, another from Church St and a 47 year old in Monmouthshire Reg who died in Oswestry Cottage hospital.

A search for John Roberts between 1914 and 1919 gave over 200 results. I found the above in the first 3 pages.

"John R Roberts" gave only 3 results, none of which appears relevant.

In the words of another from the same valley who suffered injustice over a century earlier (Dic Penderyn)

"O Arglwydd dyma gamwedd"    ("Oh Lord this is iniquity")

While researching my own family background in the parish registers for St Cadfan's Chyrch, Tywyn (Towyn) Merionethshire I came across the following consecutive entries for baptisms in 1817:

April 16 Edward Woods son of Thos. Wood and Silvina Wood. Place of abode Parish of Dolbenmaen Father's occupation Fidler

April 16 Jeremiah Woods son of Jeremiah Wood and Anne Wood Place of abode Parish of Penmorfa Father's occupation Harper

All spelling is as it in the register including the disparities between surnames of sons and fathers. Interestingly, most of the other entries in this period record the mother's maiden name.

Dolbenmaen and Penmorfa are both located near to each other in Caernarfonshire.

The patriarch of the family, Abram Wood (named in the original post), is buried in the churchyard of Llangelynnin which is a few miles from Tywyn. He is known in Wales as the king of the gypsies. The Woods were such a large family that a common expression in Wales to describe a large family is that they are "fel teulu Abram Wood" (like Abram Wood's family).

Hope this is helpful.