Solas: I heard about your organization, Sera. I am impressed.
Sera: Is this a trick?
Solas: Hardly. But it is an opportunity. You have already divided your group's membership. That is wise. No one cell can betray all your secrets. The next step is to establish a rhythm.
When your enemies pursue, you vanish. When they become complacent, you harass them. When they are weak, you strike in earnest.
Sera: Where d'you get all this, then?
Solas: Do you wish to be unnerved by another tale of my explorations of the Fade? Or do you wish to learn something?
Sera: I don't know. Neither?
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Solas: Once you have the aristocracy weakened, Sera, you will have to redirect your lieutenants.
Sera: Oh, this again. All right, what am I doing?
Solas: Some of your forces, valuable until now, have no interests beyond creating disruption. Chaos for its own sake. They must be repositioned where they can do no harm, or removed if necessary. You replace them with organizers willing to build a new system and carry out the ugly work that must be done.
Sera: What? Why? What ugly work?
Solas: That is up to you. Do you wish to disrupt the nobility, secure a title? Or change the political structure entirely?
Sera: None of it! I don't want any of that!
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Solas: I do not understand you, Sera. You do not have an end goal for your organization.
Sera: Nobles get rattled, and people get payback. I play in the middle.
Solas: Why not go all the way? You see injustice. And you have organized a group to fight it. Don't you want to replace it with something better?
Sera: What, just lop off the top? What does that do, except make a new top to frig it all up?
Solas: I...forgive me. You are right. You are fine as you are.
Sera: You hurt my head sometimes, Solas.
Solas: Yes, I have been known to do that.
Hmmm...
For me this is constitutes the clearest textual evidence I have come upon so far indicating that Solas is actually Fen'Harel, he appears to be attempting instruct Sera (a natural political anarchist who loves to cause chaos for the sake of causing chaos) in the fine art of subversion (or perhaps we could also call it terrorism?) and the importance of having an endgame... We know Solas is a great chess player, this seems to indicate that he is all about the endgame.
The bit about replacing your former Lieutenants is particularly… Sinister and ruthless.
Perhaps this would explain some of his stranger approvals and disapprovals, he is not awarding them based on personal preference or morality but rather on their political practicality.
Perhaps I should start a new thread, this is at the other end of the spectrum from fluffy Solas.