Role of Inquisitor and Inquisition in DA4

Are there any theories around concerning the idol and the one figure on it lacking it's left arm? I know it's most likely nothing but just for fun and all that.

Solas is not attacking anyone outside getting ride of people who are trying to stop him or getting in his way and he doesn't need to be physically there to do that. Red lyrium, Darkspawns, Qunari invasion, monsters infested ruins will always appear more important threats in-game.  Corypheus had real armies. Solas plays in the shadows and use people without them knowing.

Solas is near omniscient with godlike powers and knowledge on top of it. The only time where it would make sense to pit him in a battle against the protagonist would be after he executed his plan and he is weakened. But nobody knows how, where and when he intend to do what he is planning and I don't see him sharing the info.

Basically, "stopping Solas" requires either:
- Solas to have an idiot ball,
- lots of random luck, 
- working for Solas for most of the game and doing an "heel turn" at the end
- working for an equally powerful entity that can protect you from him and knows as much as him

The last one could work with Mythal, but my impression from DAO/DA2/Gaider's comic/etc is that she wanted the Veil down too...

And the last two don't have much place for the Inquisitor/Inquisition outside cameos.