I don't know if it's , like , been said but what if:
The orb was/is the key to unlock the other gods but solas was too weak because of his slumber and thus gave it to corypheus , with led to the inquisition storyline. But in the fight with cory , the orb broke and that is why solas really left (and because he chickened out on telling lavellan the truth about himself). So now he has to find a way to , maybe , fix the orb?
And if the orb can't be fixed maybe lavellan (or any other inquisitor for that matter) now is the key to free the others because she took (all) the power from the orb or something?
(que DLC and they lived happily ever after x) )
so.. what if? Thoughts?
*english ain't my main language so sorry for any grammar or spelling errors