Pure rambling theory based on the thread:

Book 17:  Rabbit Hole

Stranded and imprisoned in time by the betrayal of his closest allies, Harry Dresden, has been searching for an escape route for over a year.  His only hope for salvation rests with the most unlikely of solutions.  Now he is trapped at 1/22nd of his natural size and stranded back in time inside of Little Chicago -- the experiment he had cast off and though abandoned years ago.  But he is not alone -- something stalks the streets of Little Chicago -- and Harry will have to delve deeper into its mysteries before escaping the Rabbit Hole.

Book titles have to have matching letter counts in the two words. This would have to be Mouse Holes or something.

Very nicely done.

My initial analysis always had a big problem because I didn't have any realistic candidate who would be a major challenge to Mab (i.e. you can play Harry, but you can't play Mab) in a verse-wide chess game.  Nemesis fills this void very nicely.

I also like the notion of Maeve sending in the Hobs -- it works as a nice side gambit.

I'm not as happy with the fact the Titania appears to do nothing.  She's powerful enough that she should have a stake in the game, but I don't see how else she fits in.  One thing worth pointing out though.  CD shows that Titania was very much aware of Nemesis.  Her putting Lily and Fix under a mindlock (in PG and SmF) might very well her way of protecting them from being infected.

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P.S.
I am also a very much a member of the Mab fan club!

Recall, Summer exists to oppose and check Winter. Titania is forced to act against Winter's interest, no matter what that is. This doesn't mean she's completely blind to what's going on though. Look at Small Favor. She's required to put a force against Winter's Emissary, but the only aspect of that force that really poses a threat is Eldest Gruff. She then gives Lily and Fix just enough leave to hint at Dresden about the talisman of Summer, allowing him to delay the encounter with Eldest Gruff until he's on Demonreach. At which point, Eldest Gruff shows up, kicks a bunch of Denarian butt just in time to pull Dresden's chestnuts from the coals, and clues Dresden in to a loophole that allows him to get out of having to fight. (Middle Gruff may have also been able to throw his weight behind the scenes in fighting off the Hobb attack on Ivy, though that is pure speculation)
In the end, all that happens from Titania in SmF is that Dresden gets some aid from Eldest Gruff against the Denarians. So despite her upholding the necessary appearance of counteracting Winter, she does manage to aid its fight against the Outside.