soo are the dragons really the enemy?

[kyuven]

I can't see Iceheart as the Sin since she is the one who guided us to Midgar and warned us that something is wrong with the current Ishgard.

My best guess is that the Sin involves Ishgard allying themsleves with the Ascians or at least perform the Ascians work.

Speaking of appearance...

A fun little note about the 2.5 Part 2 section of the 2.5 trailer is that in the 2.5 Trailer you'll notice there is a mysterious Elezen Dragoon wearing a Black Dragoon Armor and wielding the Dragoon AF Weapon watching the Dragon's assault on Ishgard. I'm guessing that is Estinien from the Dragoon Job Quest.

I meant the ancient sin committed by the Ishgardians that royally cheesed off the dragons