The part with Thancred played on me. As it was the "old" Thancred and not the current one. And in this patch the mystery voice kept talking about going to the past. So what if Thancred along with the other scions are from previous timelines? Thancred could be from the time when Amdapor fell, for instance. They could use the old "his memories were wiped" cliché. The little girl could be Min, but those of us who played v1 already know Min existed in Eorzea as a child and we see her father and such. I almost want to say the child is Hydaelyn and they have been keeping her safe from the Ascians, through time. Her current crystalline state could also be a protective cage of sorts. So many things to speculate on...