There’s so much to unpack here. But, first and foremost, MAB CHOSE MOLLY TO BE THE WINTER LADY.

Actually she didn't, when it happens in Cold Days after the fact she tells Harry she would have preferred Molly to have been the Summer Lady, or rather said she felt she was more suited for that and that Sarissa would become the Winter Lady.  But Maeve and the Mantles had other ideas.  So Mab chose Molly to be a Lady, but not Winter Lady.

Now, that opens the door that Titania may have chosen Lily to be the first replacement Summer Lady. If the queen gets to choose from available vessels for fae power, Sarissa being chosen as the Summer Lady can only be viewed as revenge for Aurora’s death. After all, Mab did choose the person who caused Aurora’s death as her Winter Knight.

Titania didn't chose Lily, she was the nearest vessel when Aurora died, Lily wasn't at all prepared to be a Lady.  Titania said she would help her, and not saying she didn't, but Titania was in deep mourning for some time over Aurora, all of this led to infested Maeve being able to lie to Lily and convince her of things that brought about her end and more.

So, perhaps in a way, Molly brought herself to Mab’s attention by helping Harry arrange his death? Lea instructing her during her year as the Ragged Lady might have helped prepare her to be a vessel for fae power, but I think she was already on the board. Besides, due to Lea’s obligation, she would have been bound to instruct Molly. Molly made a cold, hard decision, against her emotional human interests, to help Harry suicide. That really does ring of Winter.

Could have, but I think Molly was on the radar before that for her warlock attitudes.. Also back in Grave Peril I think it was Lea expresses interest in Michael's first child.

Nah, they want Harry to join the Black Council.

Look at Harry's allies....

Susan - dead
Murphy - dead
Michael - crippled.
Shiro - dead
Thomas - last seen badly injured, probably dying

... hanging with Harry is like wearing a red shirt on Star Trek - and you are not an engineer.

Yeah, but two current Holy Knights and one retired Holy Knight very much alive.. Marcone has been on and off, now mostly off ally.. Lara of the White Court, Major General Toot and the minions of the Za'Gard, Mac, Gard, Rashid, Rivershoulders, Eb, Listens to Wind... So Harry isn't down to zero exactly yet.

According to Jim, the Eye is a god killing weapon.  He said even Uriel could be killed by it eventually (if he just sat there and did nothing).  It would have killed Mab if she took one or maybe two more blasts with it.  She barely survived the first one.  The Mantle would have went to Molly right away I'd think.

Except you leave out that Mab understood how the Eye worked, understanding it, she neutralized any power it may have had to kill her.

on page 394 of Battle Ground, Harry asks her how she withstood it.  First observation he made was the Eye was made of hate and destroyed everything it touched.  Mab explains how she was able to withstand it.

"Everyone," she said, "thinks that hate and love are somehow opposite forces.  They are not.  They are the same force, facing opposite directions."  She glanced aside at me.  "Love is fire, my Knight.  Love turned the wrong way has killed as many as hate.  Reason,young wizard, is the opposite of hate, not love.  Ethniu could not destroy me with a single blast of the Eye.  I was certain of it.  I ran the numbers."

So it may be a god killing machine, perhaps because most gods don't apply reason, maybe because the don't feel they need to.  It makes them vulnerable to the likes of the Eye.  Reason, is what Eve gained at the Tree of Knowledge when she took a bite.

Mab wasn’t sure of the outcome in BG, if an immortal is not killed then they are dissipated until they re-coalesce. This is what happened with Erl and Odin, but they pulled themselves together quickly, another blast? Perhaps not so quickly, but the Eye had to cycle and there were multiple threats to Ethnui, which was the strategy. We have only been told of two ways of killing Mab, there isn’t a third.

However you are talking gods, Mab isn't exactly a god.. True for the mantle, but put Mab in a blender and pour her out, the only chewable bit left is the mantle, the rest ain't coming back together in my opinion.

They're all demons, and probably all connected to the outside. Certainly Thomas's soul gaze would heavily imply that WCVs are.. I think BCVs are just the mirror image born into that person's old body. Nothing's exactly the same but they still have some semblance of who they were.

I need to go back and read the scene as well, but what I remember is the vision of Thomas, the handsome strong young man and the tug of war between his spirit, the Hunger and the mirror image of a bespectacled stoop shouldered ordinary vanilla human that Thomas would be without the Hunger.. Or at least that is how I remember it, need to go back and read.
 

Blampires aren't people. They are demons who take over the body of a dead person. Wild Bill and Yoshi are dead. They've gone through that single person door to the other side. A Blampire is inhabiting their shell, the ultimate desecration of their memory.

Yes, they are dead, but it isn't a simple matter of a vampire inhabiting the shell zombie-like, just enough of the original personality remains to torment those who knew them when they were an alive human. 

Calling someone an "It" is because they are either alien to you, or below you (they aren't a person).  I don't think it's too rich for a Vamp.  I think it's an energy source that Drakul likes to feed on.

Right.  That's what I said, but as a star born, Harry might be a step above and a "he" to feed the master, but too good for your ordinary vamp.

True but remember that it was also said "his kind aren't for us", referring to Starborn.  Something has to be different about Dresden.

Maybe starborns aren't "its"?   Harry gets a little more respect because he is one.. Apparently his body essence is too rich for an ordinary Black Court vamp.