Something that occured to me and I DEARLY hope I'm wrong: considering we've still got 4 Ascians unaccounted for, and 6.0 is supposed to be the end of the Zodiark/Hydaelin arc... I'm somewhat afarid the remaining 4 (discounting Danny Boy, who seems closer to final boss material, so far) end up relegated to dungeon bosses. The Lightwardens were hyped as being these terrifying, insanely powerful, beasts; who held control of each area of Norvrandt (Lakeland, Il Mheg, Rak'Tika, Ahm Araeng, and Kholusia; five in total, like our Ascians); yet, excepting the Lightwardens of Il Mheg and Kholusia, they were glorified dungeon bosses.
As much as I'd like to get the Ascian plot wrapped up by 6.0, it'd feel kind of... rushed. Especially if Anima is confirmed as one of the Trials (although, Anima herself could be the "ultimate form" of one of the Ascians).