I wonder if the attack on Winter was Justin trying to get back Leah because she's aware of him being alive. I suspect that he's the one who had Harry's mother killed (used Lord Raith probably), he used HWWB to test Harry as Harry suspected he was being tested in hindsight, used Leah to give Harry the confidence he needed, used Harry to fake his death and knew Harry would be spared because of Eb being his Grandfather. I think Elaine gave Harry an escape, because his death is not desired by Justin. I think Justin has (with the help of something above him) been using Dresden, testing him, and directing him.