Do the Scions know? (Spoilers)

[Eloah]

Well, my understanding is, when one dies, they go back to the Lifestream. Hence, everyone, is a reborn, sundered soul of an Ancient/Amaurotine. The WoL is said to be reincarnated and assumes the title/seat of Azem. This seems to be more plausible, though I really thought before that the WoL is the original Azem, sundered at the time of the Sundering.

This is exactly right, based on what we are told by Emet-Selch and Hythlodaeus. We are a fragment of the former individual who held the seat of Azem. And because we are of the Source, we are the vessel which all fragments return to, a Soul Jar if you will.

Currently the people of the source have 8/14 fragments, though ourselves, Ryne, and G'raha Tia have 9/14. Though G'raha's is a bit odd because, the alleged 9th fragment was an alternate him. But yes, it has been stated that we are a fragment of Azem, we are the main fragment as it were.

It's worth noting that Ancient is not synonymous with Ascian. All Ascians are Ancients but not all Ancients are Ascians. And there are several individuals who have also gained Ascian-like powers, like Zenos and Minfilia.

[Iscah]

Though G'raha's is a bit odd because, the alleged 9th fragment was an alternate him.

If you're meaning that his ninth fragment is "the Exarch", it's more complicated (but also more simple) than that.

As his younger self, he has the same eight fragments as everyone in the Source.

As the Exarch, he has lived through the Eighth Calamity and been rejoined to his ninth fragment, an unidentified person from the bad-timeline version of the First. (That person is still out there somewhere in the good-timeline version of the First that we visit in the game.)

With the two versions of his soul merged, the rule seems to be that "duplicates don't count" so he ultimately has nine unique pieces: the eight that both versions possessed, and one extra from the Exarch. If the First was somehow rejoined at this point, he would receive a second copy of that ninth soul and his total count wouldn't go up.

[Eloah]

If you're meaning that his ninth fragment is "the Exarch", it's more complicated (but also more simple) than that.

As his younger self, he has the same eight fragments as everyone in the Source.

As the Exarch, he has lived through the Eighth Calamity and been rejoined to his ninth fragment, an unidentified person from the bad-timeline version of the First. (That person is still out there somewhere in the good-timeline version of the First that we visit in the game.)

With the two versions of his soul merged, the rule seems to be that "duplicates don't count" so he ultimately has nine unique pieces: the eight that both versions possessed, and one extra from the Exarch. If the First was somehow rejoined at this point, he would receive a second copy of that ninth soul and his total count wouldn't go up.

Ah there we go, that's what I was forgetting. Thanks for the reminder.