Interesting Question Regarding Voidsent.....

[anhaato]

That's a lot of text to avoid saying it's your headcanon.

Anyways, OP, since we've witnessed reincarnations of Minfilia on the first, and we know that Ardbert was an incarnation of Azem's soul shard, all evidence seems to point in the direction that each shard has its own localized cycle of rebirth.