So, with what we learned about auracite in 3.3... it got me thinking... are Soul Crystals made of the same stuff?
Let's start with the Duma. It's able to take its wielder's wishes and manifest them on the physical plane. This doesn't sound like any Soul Crystal... except for the DRK, which manifests "Fray" out of the Warrior of Light's desire for a mentor in the discipline, as well as the freedom to express their innermost thoughts and desires. "Myste," similarly, is a manifestation of their desire to be forgiven for their sins and to lay down their sword. There is a massive difference in just how far the two go, but the similarity is there.
Much more importantly - the Otius. It seems to hold the original Ramza's personality, memories, and desires. This isn't dissimilar to how Soul Crystals hold the skills and, in some cases, memories of the wielders. The Otius impressed Ramza's personality on the contemporary Ramza, while Soul Crystals allow their wielders to tap into skills gleaned from previous holders (notably MCH is an exception, as there were none before Stephanivien more or less invented the discipline) - essentially, compressed memories. Again, the scale is very different, but the overall effect is similar (the key difference being the Otius seems to act on its own, while Soul Crystals don't... except, again, in the case of DRK's).
What do you guys and gals think? Is this a plausible hypothesis?