Ok, after Trespasser I have started to wonder about a lot of things Solas has done.
After the explosion at the Temple - does he really try to help or is he only trying to get the mark off the unconscious PC - and only when that does not work, he tries to find a way to close the breach?
Why is he really staying with the Inquisition - to close the breach or only to get to Cory so he can get to the orb? I wonder what his plan was: Quizzy defeats Cory - Solas picks up orb and (surprise!!) opens the veil and destroys the world?
And what about all these old elven artifacts we "activate"? Solas claims they strengthen the veil. Is this plausible after his revelations in Trespasser? Seems like the last thing he wants to do is strengthening the veil. He wants to tear it down. So - was he lying? What did we actually help him achieve here?
Perhaps one of the first things the Inquisitor should do after Trespasser is to destroy all these artifacts....
I don't think he played anyone. Solas made a big mistake and tried to fix it by helping the Inquisition grow. He knew his Mark could be used to stop the Breach that he did not plan to create, and as we know in Trespasser he can remove the Mark, but he couldn't stop Corypheus himself because he had only been awake for a year. In Trespasser he says that he wanted the world to be at peace for awhile longer before he tore down the Veil, so he helped stop the Qunari invasion he knew was coming long before and even now he hesitates to do anything, letting you continue to live your life.
As for the artifacts, they were cut and meant to be used in something else but became a cheap approval quest, so it's hard to say. He wanted to stop Corypheus though so I doubt he was dishonest.
Solas never lied about his intentions in DAI, only his identity and his true goal that we never even asked him about.
That however is the Solas he became after growing attached to us and the world.
If Solas never was given the chance to see things through our point of view and travel for over a year with humans, elves, dwarves and qunari, he would have most likely completed his task once Corypheus was gone without even considered anyone as people. Interestingly enough, if you have the lowest approval ever, he still respects you enough to give you a chance to live and stop him.