Ishgard' s archbisschop

[Catapult]

other than the heretics seen held in the cells under Whitebrim Front (and those unfortunates ramble about the Dravanian Horde, ala the dragons, not Shiva).

Now this is an excellent point. The heretics certainly exhibit the traits typical of the heavily-tempered.
Thus far we have only seen symptoms of the lightly-tempered amongst Ishgardian behaviour, which is difficult to distinguish from conventional zealotry. Could this be due to remaining outside the Gates of Judgement?

I had an earlier theory that thought Shiva may be the primal of the dragons. That's still plausible, though I still think her being summoned as Halone is more probable, playing the long-term game with the Holy See as discussed by others.

[Kyan]

Now this is an excellent point. The heretics certainly exhibit the traits typical of the heavily-tempered.

My only concern there is that, many sources of dialogue suggest that people are behaving that way because of excessive torture. Some of them may be heretics, some may just be saying anything at all because they've been broken physically and mentally.