Rag,

How an event TWO YEARS AFTER the initial agreement can prevent it from being enacted is ridiculous.

Oh dear. I can't make it much simpler for you Rag dear.

The initial agreement was for a peaceful transition to independence.
Unity and consensus was finally achieved.
Before the war ended and it could be enacted, the violent and bloody rising destroyed the unity and consensus forever.
The Unionists wanted no part of such an unstable and violent state.

So, two years after consensus was achieved, but before it could be acted on, the rising ruined everything for everyone.
Ok Rag?