Yes, it is *a* factor, in the sense that people's emotions change and can fade over time, in the same way memories do (since they're often one and the same, within the workings of our brains). What I was getting at was the fact, that you could have lost your wife/husband/partner/lover years ago, but so long as emotionally you still have the same feelings for them or your memory/attachment of them, they might be strong enough to still protect you. Possibly strong enough to leave a sufficient imprint on meaningful items even, such as the wedding ring, so long as you still interact with those items daily while feeling those emotions, in essence the exact same principle as enchanting something and refueling it over time.

We are forgetting, that Harry is not actually "good" at quick-magic (he cheats via stupendous brute forcing of magic juice with his tremendous power reserves and physical stamina), and especially not large scale or complex ones, like controlling the various "systems" incorporated into Merlin's tower seems to require. So I think it is actually possible for a single wizard to operate all the defenses, if they're good at that sort of thing. I would expect that it does not even have to be a spirit of intellect specifically, that would be required to be a stand-in for such skills, either, e.g. perhaps someone/something like the gargoyles may be able to do it too, or at least specific parts of it. And potentially, he could perhaps achieve the same level of control of those systems Bob has, but he'd need a bit of prep time for a more "serious" ritual to temporarily connect to them more directly, since with the battle at the end he only had like half an hour's worth of warning?

IMO the Red King is (was?) absolutely an Outsider ally, but is not one of the 13 "nemfectors", same as Lord Raith.

Red Court vamps are with 99.9% certainty a similar "hybrid" and/or parasite state of "lesser" outsiders with mortals, like the White Court are, especially given the fact they've had much more blatant/obvious Outsider theming and influence throughout the series.

There's also one crucial fact to consider... do these 13 nemfectors have to permanently inhabit a single someone/something in the material world, or can they infect multiple beings, but can only actively control/observe through one of them at a time each?
I don't think this was ever actually clearly stated or clarified/mentioned in the stories nor WoJ.

Love to hear your thoughts.

I think you're forgetting the fundamental fact, that Mab is *not* a fully-fledged "character" and she is absolutely one of the ones (beings like the angels, the Mothers, gods, etc.) most self-aware in-universe of that fact. 99.999999999~% of Mab's actions in the past millennium or so are as a direct result of her being a "puppet" to her fate as Winter fae/Maiden/Queen. But everything she does is in essence "Mab," that being steering the world towards it's continued existence, no matter the cost to her or anyone else. Any "inconsistencies" are as likely to be just a fundamental "expression" of fae-ness (who are deliberately mythologically contradictory in essence, outside of the few fundamental "hard rules" they have, which are actually pretty flexible in their own right) as they are legitimate writer's faults.

-   And separate and apart from the above the issue of Mab obligating herself openendedly to Dresden, WTH was that scene in Dresden’s bedroom?  Mab seemingly willing to have sex with Dresden, perhaps to the point where Dresden’s consent (or lack thereof) was becoming a real issue.  And then Dresden physically assaults Mab?  As the Winter Knight, how is that possible?  And even if possible, why would Mab allow it?  Just to show Dresden that he was the Winter Knight in all of its meanings?  Remember the Cold Days scene when Dresden threatened Mab with a gun?  Where is that Mab? 

With that said, this point in particular, at least to me, indicates how much she actually appreciates Harry's usefulness, by allowing him exactly what Harry seems to value the most, to express his Free Will to seemingly screw over "the bigger bads" and show them that he won't "play ball," without him realizing how "badly" he's actually being played by them.
Only at the end during the exorcism ritual of Thomas did he realize how "well played" he got, yet again.

I think she is only sometimes aware. She's often surprised by what Harry does or says to her.

It's quite likely that she has to actively focus or deliberately recall such information post-facto, but it is definitely firmly established, that such knowledge is absolutely part of either her "natural" abilities or her Winter Queen intellectus.
But this fact, combined with the fact that she knows more about the "mechanics" of true love protection against White Court vampires, is enough to understand that she absolutely knows whether Harry is or isn't protected at any given point in time.

In regards to Mab often being surprised by Harry's (re)actions, that's quite logical, because even people themselves don't really know how they will act, based on what they think or what they (think they) feel, much less other humans. What Mab most certainly can do (and does all the time) is calculate (and far better than most humans can) based on the thoughts and feelings of others, since while she no longer experiences those things exactly the same way humans do, like she said: "[she] was mortal once."

  Does that not mean that his or her free will was screwed with?  Harry chose to suicide based on the lies that Lasciel whispered in his ear.  Because he made his free choice based on her lies, Uriel was allowed to step in because since his choice was based on lies, it really wasn't a free choice.  I know, this stuff gives me a headache too...

No, actually, that one's easy. It's not the "his choice was based on a lie" that matters, it is "who told him the lie upon which he acted" that does. As long as the choice is made due to a Fallen's direct manipulation/involvement, Uriel gets to interfere (to the same extent as the Fallen did), due to the White God's stipulations. If Mab had told him the same thing Lasciel did, and Harry acted upon that the same way, Uriel wouldn't be able to do anything to stop it.

The *current* version of the Accords is from 1994.  The Accords are old enough that all the players have the rules pretty well figured out.  Plus, they're built on systems that are older, like guest rights.  It's like the last time a bunch of people got together like in Peace Talks to update the Accords was '94.

That's wrong, even the Dresden Files RPG says so:

"THE UNSEELIE ACCORDS

In 1994, factions from the Nevernever went to open battle with each other in Milwaukee, Wisconsin. Such things had happened before, of course, but mankind had a new tool for sharing information rapidly and globally: the internet. With the advent of the Digital Age, Queen Mab recognized the need for improved security and discretion and acted accordingly—and swiftly—to end the conflict in Milwaukee and limit the potential for future outbreaks of violence. The result of this action from the Queen of Air and Darkness was the Unseelie Accords, signed by those same warring factions. Mab’s influence and will are not to be underestimated."

And the WoJ seems to be (the source I have for it does not mention where the original WoJ is from):

"How old are the Unseelie Accords? They are Mab's accords, and she hasn't been in charge forever, after all. "
The Accords are fairly recent: they were signed when Dresden was a young man, before he went independent as a detective.
If I was writing it all again, I'd probably make them something happening early in the series. Chicago would have belonged to the White Council and been their dumping ground for problem wizards--the ones who weren't quite bad enough to kill, but who had to have an eye kept on them. Harry could have conflicted with the genuine bad-guys-in-process, emotionally saved maybe Mort Lindquist (who would have been one of them) and probably screwed up hard enough for the White Council to lose Chicago, making it essentially open territory, like Casablanca."

Also, Proven Guilty states this:

"There’s a sign Mac’s got hanging up at the door that reads ACCORDED NEUTRAL GROUND. It means that the place was supposed to be a no-combat zone, under the terms laid out in the Unseelie Accords, the most recent and influential set of principles agreed upon by most of the various nations of the supernatural maybe ten or twelve years ago."

IMHO, if there *was* something equivalent to the Accords before 1994, it clearly didn't include anything which gave Eb (or the WCouncil in general) any grounds against the WCourt.

I believe the intent is more along the way of a security camera system, where you can have as many cameras as you want, but you are limited by the amount of screens and terminals at your disposal, to watch and operate them live.
So I think there can be an unlimited amount of infected individuals, but Nemesis can actively control or manifest through only 13 or so of them at a given time.
I would also argue that this limit is per universe/dimension/timeline as well, because otherwise having such a tiny limit would practically make Nemesis impotent, since we know there are hundreds of thousands of universes if not millions or more, due to every "major" decision from a ("important?") mortal creating a separate one.