Question regarding the Shards... *story spoilers*

[Gaethan_Tessula]

But then, how is it that G'raha Tia continues to exist in the First?

I find that it's still possible that the protagonists lose and A G'raha Tia needs to sent back in time again.

If that's the case, we're not going to see Exarch G'raha vanish until the possibility of the or an 8th umbral calamity is truly past.