The Ladies can ride the Unicorns which is usually associated with virgins.

Harry did ride one in Battle Ground, but standing next to Thomas, Harry looks pretty virginal. As would most men.

The trinity is the Maid, Mother and Crone, and I think in this Jim has been influenced by Pratchett, and his witches, Magrat, Nanny Ogg and Granny Weatherwax (who I suspect influenced the character of Mother Winter).

Jim has made much of Molly’s ongoing virginity, it surely played a major part in why she rather than Justine or Murphy were chosen by the Mantle. Remember, inside the Circle the Mantle had limited choice,  but it did have a choice of candidates, and Justine and Murphy were not maids. It just so happens Molly was Mab’s back up, indicating Mab’s prolonged scheming in relation to her. Preserving her virginity was undoubtedly part of this.

In Proven Guilty Molly has a boyfriend, Nelson, a Harry lookalike, her powers are manifesting so her potential as a candidate comes across Mab’s radar. The Gatekeeper tells Harry to investigate Black Magic in Chicago we do not know at this point that the Gatekeeper is allied with Mab. Molly is abducted by Winters Phobophages and taken to Arctis Tor, Mab’s stronghold, rescued by Harry’s party, and faces the White Council, saved by Michael suddenly appearing, obviously due to Uriel’s influence’ but we don’t find out they are working together until Ghost Story) Molly is put under the care of Harry (her unassailable crush) and tightly chaperoned thereafter.

Mab, the Gatekeeper and Uriel appear to have been working together for some time to get a Winter Knight and Winter Lady suitable for the forthcoming travails. Both proved pivotal in Battle Ground, clearly a starter course to the BAT.

I think I used it correctly. The point of using prodigy to join two royal houses is to be able to join a line biologically to the line of succession, thus producing an heir. But you get the point.

Powerful is a relative term - compare Thomas TO his relatives. Harry and Eb. Thomas is but a wee little bairn.

the Black Court are former humans. Mavra early on was above Harry's ability to take out, save perhaps with his death curse. Whites are a separate breed. You have to be born a Whamp. Reds might have spell ability too

Well, we know The Ladies, Queens, and Mothers of BOTH courts are also Hecate, which is not bound to either court.
This is pointed out in Skin Game when Dresden sees a statue of Hecate, and likens it to all 3 Queens from BOTH courts (Was, Is, & Will Be)

I described what he does.  If he needs Harry then he always finds him. No matter where he is.

  I doubt seriously that Mab has access, she wasn't just being polite when she asked Harry if she could bury the Ladies on the island.  That is an acknowledgement that the island is his realm now.  Also the fact when Harry threatened her by saying if she didn't answer his questions he'd have Alfred take her below.  She turned pale, he can in effect do that.

Mab for Mab(WOJ is that Mab Is licensed to practice law), and some nameless, as yet, mouthpiece for Lara.