Wasn't the crux of Thancred's arc in SHB the choice to bring back the old Minfilia or let Ryne be her own person and accept the future instead of the past or something mirroring the ascians unwilling to let go of their past? I'd have to rewatch the cutscenes again but I'm pretty sure we're not seeing Minfilia again, though they could find some way to bring Ryne and/or Gaia to the Source if they really wanted to.