She turned Lily into a statue then put the mantle in her,  so while technically you can say that Aurora had chosen her as her new knight, she didn't really because there was still an imbalance.  Which is the point, Aurora wanted to start a war, so she turned Lily into a statue and hid the knight's mantle inside it.

Here is another question, Maeve and Sarissa are Mab's daughters, at some point unless they are
the product of virgin birth, she had to have sex..  One assumes that Mab was also Winter Lady at some point in her career, so did she have sex and have her daughters before she became Lady?  Was there a special exception like perhaps having sex with her Knight which resulted in the birth of her daughters?  Or after she became Queen?  Then she had sex and had her daughters...  If the first, then one doesn't have to be a virgin to become the Lady, Mab already had given birth.  If the second, depending on who she has sex with she doesn't have to stay a virgin to be the Lady, her Knight the exception? If the third, well the Queen can have sex with whomever she wants.. Actually we know that one for a fact since she had sex with Harry when he became her knight.

Telling him to be sure to tell Maggie who it was from also obligates him to explain just who his boss is—and what his job is. Therefore obligating Harry to embrace responsibility.

Hmm. Being the guilt factory that Harry clearly is, I wonder how long it’ll take him to figure out that if he’d just boinked Molly, that she wouldn’t be the Winter Lady?

Are white court vampires considered monsters, even if they are being piloted by a pc? Outside of fate points what differentiates them from any other monster? Even if they look more human than most.

How about if all of the friends/family/allies/etc of everyone fighting on the side of the Longinus-wielder (that is to say, everyone NOT in the scene but connected to anyone who IS in the scene) get an immediate Recovery:  the most-severe Consequence moves one step less-severe, including Mild consequences just going away.  No tactical advantage in-scene, but a pretty vast & sweeping benefit (potentially to hundreds of people) out-of-scene.  People at death's door become merely "very ill," etc.

I feel like the spear should have a curse attached to it.   The shroud already heals, the coins are cursed, the noose gives immortality with a Catch. 

Wasn’t the soldier who stabbed Jesus cursed?

Also, it ignores the fact that Jesus was SUPPOSED to suffer and die there:  rather than some sort of "OMG it can even hurt God" feature, there's some sort of Holy Sacrifice thing going on.

There should be no direct benefit to the wielder, though maybe something for allies in the scene?  Dunno... it feels like any sort of "tactical advantage" element is off-theme here...

Have you read the Dresden short story The Warrior?  Overtly, it's about one conflict.  But at the end, Harry learns how his actions in the story had very very many far-reaching effects he completely didn't know about.

A demon could ask for seemingly-innocuous stuff that has those kinds of "hidden" knock-on effects...  "Go buy that upset-looking lady at the County Fair an ice-cream cone."  But what you don't know is that she's upset with her insanely-jealous boyfriend.  He's walking back to her as you leave, sees that Some Other Guy has bought His Girl a sweet treat.  So he drags her back home and beats her within an inch of her life.

etc...