Deception can take many forms, lying is just the most blatant.

Training young wizards would be more a school for the Arts rather than a vocational school.

Perhaps the solution would be one or two years of fundamentals and Laws of Magic with  a core of permanent faculty and weekly guest speakers. If the students pass this basic assessment then they could be split into their specialties and learn from teachers who are experts in them. That will increase the teacher pool because the students will be assisting rather than taking away from their private interests.

I think the main difference is where a particular mantle stands on the power scale, what created it and more specifically if it grants immortality. There are capital M and small m mantles.

Mother, Lady or perhaps even Kringle grant immortality. They have much greater restraints on their holders freedom of action. Warden and Winter Knight are either created by or meant to be held by mortals. Winter Knight is more powerful than Warden(It works everywhere) but it does constrain Harry to obey Winter Law to maintain access.

Where was it confirmed as Maeve? And where does it say they came from Arctis Tor? It's definitely not in the books and I've seen no WoJ on the matter.

Why would Nemesis(Maeve) waste it's supposedly one free shot at the Way to Demonreach on a minor side scheme when it could do a full jailbreak? Just bring an allied warlock to Demonreach before TC. Have him/her become Warden and let school out while Mab has no active Knight and no Lady to help her.

Potentially it does disqualify it, if any hint of collusion could result in hades Vault in Marcone’s Bank from not backing onto the Vault in Hades Realm then having the same space used for a different purpose would do the same thing, especially if there is another candidate which doesn’t have that dual purpose.

There is also the point that both the Gatekeeper and the Winter Lady used the Never Never route to Demonreach. Neither has any known association with Hades or Tartarus, both have associations with Mab and Arctis Tor. Mab will leak information to find out those she cannot trust and wait for them to prove her right, she did this with Nameless, perhaps she did the same with Maeve and the back door to Demonreach, indeed the attack may have been an attempt to verify the information by Maeves allies as much as release Lea. It was shut to her after this, suggesting Mab’s game.

People might want Demonreach to back onto Tartarus, bur there is no evidence for this, but there is circumstantial evidence for Mab’s Ice Garden, by those who have used the route to get there.

So what hordes of world threating monsters and demons are imprisoned in Mab's garden? The only actual time it appears in the books, it's being used to hold Lea to cure her. We know that she punishes people there but it's mostly her vassals that displease her(most recently Nameless, Laplander and Harry in The Law). I don't think anything she has would be more than a Nagloshi. Demonreach holds fallen Gods. It's Never Never analog is someplace with equivalent or greater prisoners in equa numbers. That doesn't have to be Tartarus but it should be in that league and Mab's place just isn't.

And once again this theory hangs on that direct Way from Arctic Tor that's never been even inferred by the books. Yes, Peabody met someone in Chicago, a known nexus of Ways, but where is it stated that it was Maeve and that they came from Arctis Tor? If an already Nemfected Maeve had known a Way to the island, she could have loosed the sleepers before Harry ever became Warden or Winter Knight. Rashiid says he knows a Way but we have no way to know where he started from. A spot that approaches the Outer Gates would seem to be a better choice. 

Cereberus will not come out of Demonreach three words Wet Dog Smell. And it would be truly epic. Cereberus would also have to deal with Alfred, who I suspect would, hug him and pet him and pat him and kiss him and call him George.

I believe Harry has commented on Mister getting old in Peace Talks and Jim did in Little Things.

As regards Demonreach and Tartarus being analogues, Tartarus is an afterlife, not a prison for the here and now and is hardly escape proof, Demonreach is. The analogues would be for a prison for the living which has never been the subject of an escape. Only Mab’s Ice Garden springs to mind.

He worked with Etienne on providing a sanctum which puts it around the 1200’s

Someone needs to do a bit of research on Greek mythology:

In Greek mythology, Tartarus (/ˈtɑːrtərəs/; Ancient Greek: Τάρταρος, Tártaros) is the deep abyss that is used as a dungeon of torment and suffering for the wicked and as the prison for the Titans. Tartarus is the place where, according to Plato's Gorgias ( c.

Tartarus - Wikipediahttps://en.wikipedia.org › wiki › Tartarus

Tartarus does double duty as an underworld for mortals and the prison ofthe Greek Titans and other monsters. This is true of most mythological/religious hells. The monsters/demons are sent there and later the wicked souls of humanity are banished there. Mab's little ice garden is her personal prison but it isn't even as good a prison as Demonreach, otherwise it would have a much larger population.

Do we know if Harry's housekeeping brownies were Summer or Winter Fae?  If they were Winter, then I'd say Mab fixed LC as part of Lea's godmothering. Since Lea watched Harry's place foe enemies, it would have been simple for her to enter a a benign fae while Harry and Bob were out just like the cleaners do. Mab did the same while covering for Lea and spotted and fixed the flaw .