So... Is Lahabrea REALLY dead-dead?

[Layte_Aeon]

Minfillia never reincarnated though. She possessed others, much like the Ascians do, until she eventually allowed herself to be subsumed into Ryne. Gaia however was dispersed into the lifestream to reincarnate naturally. Besides if Gaia did reincarnate other times it seems strange for Mitron to not mention so, given that he can communicate with her on some minor level, even while stuck as Eden.

[Veloran]

Minfillia never reincarnated though. She possessed others, much like the Ascians do, until she eventually allowed herself to be subsumed into Ryne. Gaia however was dispersed into the lifestream to reincarnate naturally. Besides if Gaia did reincarnate other times it seems strange for Mitron to not mention so, given that he can communicate with her on some minor level, even while stuck as Eden.

Minfilia, no. "The Minfilias", aka Ryne, seemingly so. It appears as though Minfilia only ever possessed the shard of herself as she was reborn, hence the girls being found as children and growing up as Minfilia. And then when she was "subsumed into Ryne", that was a rejoining, we can hardly consider it any other sort of mechanism.

As for Gaia, we neither know the way in which that was possible for Mitron nor if he even did. A lot changes on the First in the 5.0 storyline and we only interact with Mitron so much, him not mentioning something isn't evidence either way.