What if there's an earlier POD were the Provisional IRA after the split of 1969 remains a minority and the official IRA becomes more entangled with the extremist communists groups they were already courting by that time?
If that happens, then we have to look at the nature of the OIRA. Which was, to put it mildly, confused. This is a case where rhetoric and actions are not a reflection of each other.
The Official IRA claimed to be focused on defence of Catholics and that it would only engage in attacks in retaliation for being attacked.
However, retaliation was often pre-emptive, and it included retaliation for such things as Catholic nurses treating injured Protestants in hospital.
The OIRA claimed that it did not think Ireland could be unified until there was peace between Catholic and Protestant.
It also actively tried to create no-go zones for Protestants, with a view to ethnically cleansing the island, zone by zone.
It was a heaving, steaming mass of contradictions.
However, one thing is clear. Had the OIRA been the most powerful faction, it very quickly wouldn't have been. The one thing it was really good at was splitting into factions that hated each other more than they hated the British. Having formed in 1969, by 1974, it had split into the OIRA and the INLF and the INLA and the Workers' IRA. And possibly others. Those are just ones I can recall. You know that scene in Life of Brian, where the various Judea People's Fronts are more angry with each other than the Romans...
...That's
exactly what was going on among the OIRA. To the extent that I'm reasonably convinced that Life of Brian was sending up the IRA.
Loyalist graffiti at the time included the phrase: "Whack away, boys." This was in response to the OIRA, INLF, INLA, and WIRA assassinating members of each others leadership. I understand that the PIRA also got involved, but was rather more competent than the various flavours of Marxist IRA groups, and quickly, the OIRA, INLF, INLA, WIRA and others became footnotes. They'd do the occasional atrocity, but they largely existed in order to fight amongst themselves.
To try and give a flavour of the times, in 1975, the OIRA shot and killed a 9-year-old girl, This was to persuade her father, a leading member of the INLA, to become an informer. If I'm honest, I can't quite see the logic here. I wouldn't have thought that murdering someone's daughter in front of them would make that person a reliable informer, but I confess that I have difficulties acquiring the thought processes of the OIRA.
And the constant, never-ending struggles with the PIRA...
Of course, in some circles, the OIRA are considered to be "heroic" and "worthy of respect", because they cloaked themselves in the rhetoric of far-left Marxist thinking. It's a waste of time explaining to that circle what the OIRA got up to, because Rose-Tinted spectacles can be very powerful things.
My guess, if the OIRA becomes the most powerful faction - in five years, tops, it won't be the most powerful faction any more because it will have split into a dozen groups who hate each other, and the more disciplined PIRA will, by default, become the largest faction.