Why is it that everyone forgets that the Sidhe can lie.... through the omission of fact, through obfuscation and through sheer enjoyment of twisting up  the English language? Through confusion and the ability to utterly bewilder a person so much so that  they make a choice based on a lie?That is what Uriel's 7 words are - to remind Harry ; no matter what Mab says she will always omit something and it is Harry's choice that will bind him.Remember Fix and Summer and how they gained Harry's aid once
 The Harry that made the pact with Mab is a very different Harry than the one in Ghost Story.Through Molly's mental exercise on his part,Harry has been given trials by fire that he would have done differently if he remembered himself and all his machinations in Changes.By having Kincaid kill him, by having his meeting with Murphy's dad, by having  a small hope/suspicion of his finally given breath ( why aren't mommy and daddy's shade about? Why haven't I met with them... they are dead; right?)By  seeing his friends cope and the Justice league set upon this is a different Harry - not the let the world burn man at all: not the early monster.
 As the Winter Knight  he will grow more powerful, gain more allies and insight.Uriel has not abandoned him.Mouse is still in his house( guarding lil Maggie at the Carpenter's) and mom...well I don't think he has lost the medallion, I think it is within.If not my money is on Lea.