According to Odin chose to become mortal but keep privilege to meddle in mortal affairs. Of course as ex-Aesir he was still as mortal powerful wizard, so it's no wonder he restored much of his power by gaining various mantles including mantle of Winter King (which was presumably somehow shaped as memory of him, so it could get easier). Also it's a place where I have to say I really dislike how they use Kris Kringle as almost his proper name considering it's relatively modern concept that arise when German settlers for whome Baby Jesus was giving presents on Christmas - it's result of improper pronounciation of Christkind - (ergo Christ-Child), that was mixed with classic Santa Claus vision.

I doubt it's Jim intention - he probably just choose nickname used most in his region but if I was paranoid I'd make theory how Odin is trying to steal mantles from Jesus himself.

That isn't so crazy, you know.  Somehow Odin managed to pick up the soul of a devout Catholic.  There might be more cross over between Odin and Jesus in the Dresdenverse than you think.

Ability to astral project yourself as shade would be quite cool?

I think Astral projection and his ability to create a body for himself while doing so will be integral to the time travel book, whenever it happens.  I think he has to time travel as a spirit and then make a body to interact with the world.  Thus there will be both spiritual and real world encounters in that book.  I think he will be at the battle of Arctis Tor, which is the ace in the hole that Mab pulled to beat her enemies in that fight...

If the senior council needed to know and it was safe to tell them, they would know, because Rashid would have told them.  Rashid hides what he is from the Council, because he would be subject to attack away from the gates if it was revealed who and what he is.

To some degree I agree with this, but remember Nemesis knows who Rashid is, so all of his real enemies, the people who would want to kill him for being the gatekeeper already want to, whether the council talks about the Gates or not.  I think the council doesn't talk about it because the less information about outsiders the better in terms of most wizards - i.e. if they don't even know about them they can't mess with them.  But that is all falling apart as the Outsiders are obviously becoming extremely active about wanting in, and we've seen that three different Walkers are active inside reality now.  The time for keeping things secret passed several books ago.  The entire idea that you shouldn't talk about nemesis because it might hear you is kinda bunk, because that's assuming that it doesn't know that the faerie queens and great powers know what it is and oppose it.  Look at how wrong things went because Lily was never brought up to speed about it from a trustworthy source?  I can't help but wonder how Nemesis would fare against a knight of the cross, i.e. can they detect a Nemesis infection?  If Butters saw Justine at the end there, would she have had a big glowing exclamation point (or whatever the enemy has to his senses) over her head?  Can the sword free someone from Nemesis infection?

Several points to consider:
1.  We believe the gatekeeper is the oldest of the senior council, since he took down the Abdul Alhazred in 730 AD, according to WoJ.  Also according to WoJ, the path to the gatekeepers personal demesne involve briefly walking on the moon, so we can assume wizards made it to the moon long before the rest of mankind did.  If that is possible, I see no reason why the white council wouldn't be in contact with the America's before Columbus.
2.  In the way way back, there were a lot really bad things running around.  Way more than now - think of all the things locked away in Demonreach and by the Ventori helping the world forget them.  There probably weren't that many more good things though, since why would we lock those things away?  Maybe there was more direct intervention from various human pantheons, but even most of those are at least 50% evil (or have an evil opposite like the Jotuns).  So Wizards back then might have been much more active in fighting for humanity than they are now, and a lot less worried about policing themselves.
3.  Certain areas may have had less wizards per population that others.  The Aztec/Incan region seems to have been ruled by the Red Court at the discovery of America.  I see no reason why they would encourage/allow humans in their care to become wizards, and probably rooted out those with potential, leading to a very low wizard population in at least half of the new world.
4.  Excepting certain powers intervening (ala red court in Mesoamerica) the population of wizards should probably be reflective of human populations, so it certainly does seem that the council is horribly western in leadership, considering that about 60% of the world population lives in Asia.  And considering the references Harry has made about their locations, etc. it seems it has probably always been European dominated, which seems wrong unless there is a similar reduction in Asian wizard populations for some reason (hunted by jade court, etc.)
5.  I do wonder though, back in the day before world exploration, it seems like it might have been relatively easy for the wizards to find each other with divination sources and paths in the NN, but it seems like communication would have been a total beast.  There doesn't appear to be any magic way to learn languages (else Harry would be better at Latin) short of putting a demon in your head, and while it might have been easy to find a path to the America's through the NN, when they come out communication would be a bitch, and not what most people do for fun.  I've got to think there has to be more value to being part of the Council or more punishment for breaking rules, else there is no way the world's wizards would have joined up like they appear to have done.

What happens to stuff worn by beings locked into demonreach?  Left where they were grabbed?  Imprisoned with the being?  Put in the demonreach armory? 

Just wondering where the titanic armor winds up....

So how’s this for an analogy – Someone writes the coolest online game ever (GOD).  Assigns system admin to run the game (Angels), but not to stop hackers (outsiders).  Players can go from random players, to heads of guilds, etc. so there are many varying levels of power depending on how seriously they play, and maybe how much the system admin trust them (people up to fey, little g gods, etc), and GOD wants them to like the game so much they are willing to work to protect it from hackers.  One system admin goes rogue (satan) because he disagrees that protecting the game from hackers is a player job and things it would be much better to be a system admin job.  Other admin now spend a lot of their time keeping him locked out, so his main way of messing with the game is encouraging the players to be dicks, occasionally giving out cheat codes, etc. hoping that if they all will do as he says, he’ll effectively run the game anyways.  So system admin might do their job because they love god, love the game, or love the players but they can absolutely only do what they were assigned.  Uriel risks things because he loves the players.  Michael might do his thing because he thinks God is the bomb, while Raphael might do his thing because he just loves the elegant system architecture and thinks the game is the best.

1.  Accorded attendees seemed really low count.  Why no black court, shapeshifter, or organizations from other countries?  I mean, you really mean that we know all the accord signers already?  There are no other signers from Asian folklore?  Odin is there, are there no other gods/pantheons with people active enough to be signers?  I thought this was going to be a chance to show the league Harry was moving up into by showing us the next tier of players, but no Drakul, really just about nobody new.

2.  Book was waaaayyyy to wordy.  I think a good 25% of the book was summarizing what had happened in the previous 15 books, short stories, or graphic novels.  Telling readers what they already knew if they have read the entire series.  It really made especially the first half of the book a slog.  I found myself skipping whole pages on the first read through as he dropped the same summaries of people we know or things that have happened before into this book that he dropped into previous books (or at least it sure felt that way).  By the BAT Jim is going to have to decide if he is writing for readers of the series or not, because if he continues to write each book so it can be read by a new reader, its going to be 75% summaries of previous books and only 25% new text, and I'm not sure I can take that.

3.  Murphy drove Thomas and Lara to the boat after meeting them outside.  That put very strong moral restrictions on activities for no reason Lara would accept.  Why wouldn't Lara have arranged her people to pick up Thomas and take him to the boat in a limo - a limo with 3-4 women in the back for Thomas to feed upon immediately?  She knew he was being treated badly while being held, she could assume he would need to feed. 

How long was the book, compared to others in the series?

Counting only new text, or also old?  I mean, I think a good 25% of the book was summarizing what had happened in the previous 15 books, short stories, or graphic novels.  Telling readers what they already knew if they have read the entire series.  It really made especially the first half of the book a slog.  I found myself skipping whole pages on the first read through as he dropped the same summaries of people we know or things that have happened before into this book that he dropped into previous books (or at least it sure felt that way).  By the BAT Jim is going to have to decide if he is writing for readers of the series or not, because if he continues to write each book so it can be read by a new reader, its going to be 75% summaries of previous books and only 25% new text, and I'm not sure I can take that.