Solus has previous experience running the empire, but he can't be the face of it again. That has to be Varis's role - the recognised, living emperor - or 'Zenos' if the Ascians decide Varis has outlived his usefulness. (As much as anything, maybe that's why they haven't just killed him and replaced him - they'd rather leave the mundane work to him while they... I don't know, sit around scheming and looking dramatic.)
What Royal Allagan Spellbook?
Although I saw a theory somewhere that the original Garuda might have been an Au Ra, and if they were indeed involved with the original Ixal who are confirmed to be Allagan creations.... hmm.
Also if I remember correctly, the Boulder Downs ruins were being used by the heretics as part of the same tunnel network as Snowcloak?
(Anyway, yet another reason for the eventual Back To Ishgard story arc. Right, Square Enix? Right??? please?
This got brought up in another thread the other day.
Urianger is now absent from the Waking Sands UNLESS you still have quests to collect from him.
But that reminds me of something else I noticed and wondered about - one of the Omega cutscenes shows...
characters from the Crystal Tower and Alexander raids. I wonder what happens if you haven't cleared those?