Yeah it's possible. I heard what Benedict said after I unlocked him and it, imo, was the most intriguing part of the game. Could it have been Eris that brought the cabal to the tower? Cause it's never said where she went. It's just said that she wasn't at the tower. And at the end of TTK when we killed Oryx (in the missions not the raid), she acted very strangely. So if this is true, my money is on Eris.