So. I had this theory. And it's probably not the strongest theory...
So when Cory attacks Haven and has his douchey monologue with you about his plan and tries to take the anchor from you, only to find out it is permanently attached to you...what if it was Solas who attached it to you.
"I do not know how you survived, but what marks you as 'touched', what you flail at rifts, I crafted to assault the very heavens."
Since Cory claims that he "made" the anchor, wouldn't he have known it was permanent? Could Solas have been the one to have somehow made it attached to you? Since he claims to have stood by your bedside while you slept teehee and "stablized" the anchor so it wouldn't kill you. Considering the power came from his (or Mythal's, whatever floats your boat) orb, odds are he would know how to manipulate it.
So if Solas was the one to attach it to you, was it solely to keep it from Corypheus? Or perhaps he was thinking long run in how he would be able to use you for his own plan, if retrieving the orb itself failed.
I don't know where I'm going with this, but someone care to discuss this? Tear my theory apart maybe? Since I'm not too knowledgable about a lot of lore at this point.