The only way a coin can be taken up is through Free Will, meaning Sanya made the choice.  Was he influenced?  Absolutely, but he made the choice freely.  At that point in Sanya's timeline, I don't think they (The White God/Knights of the Cross) planned anything regarding him except maybe an eventual death.  When Shiro came along, after Sanya realized what was happening, they saw an opportunity because he had previously freely given up the coin to become a Knight, which he then again, chose freely.  I don't feel that was a long con or a drawn up fate waiting specifically for Sanya, but the combined consequences of all of his freely made choices and actions.

While Little Chicago is a interesting mystery to me, I liken it to his Force Rings or Shield Bracelet.  At the beginning of the series, he had his staff and blasting rod and a few knick knacks.  Then, his rings became 3 rings in one n a couple fingers, then by the time changes came around, his bracelet was able to stop physical, thermal, electrical, and magical attacks and his rings were on each finger with at least three on each finger.

This says to me, as a few people have argued, that this was mostly Jim showing us Harry's progression and development as a wizard, and this was the most prominent, mainly due to Bob saying how impressed he was with what Harry had done.

I personally view LC as a rough draft, and we'll eventually see something bigger and better that will have a specific purpose say maybe 3 or 4 books from now

So I have had this thought festering in my head for the past little while, and while I doubt this theory, it gives us a discussion while we wait for Ghost Story.  Now among all the beings we know of with interest in Harry, we need to think of those with both the ability and desire to prevent Harry from frying his brain.  Of those, I submit the following:
Mab
Lasciel
Uriel
Ivy/The Archive

Okay, the easiest to eliminate from these beings is Uriel, because he is only allowed to interfere so much, and he gave Harry the ability to use Soulfire (presumably). If he did or did not is a discussion for another thread. So, strike Riel from the list of suspects.

The next suspect that I can eliminate us Ivy/ The Archive.  Why would Ivy wan to help Harry? Affection, knowledge of him being needed in the future? Who knows.  The ability to fix it would require an insane amount of power, which she has.  The reason for that is that she is completely neutral, and an arbiter of The Accords.  Thus, evn though Ivy would have the desire to help Harry, The Archive can presumably override Ivy, thus the suspect is eliminated.

Now I will try to eliminate Mab.  The reason why I doubt that Mab would fix it is not because of her desire to have Harry as her Knight, but rather why would she? She is Mab, to her, a simple human is nothing, and she could easily allow Harry to blow up his mind, fix him, then say he owes her.  Thus, it stands to reason that she could potentially benefit from Harry blowing up his mind.

Finally, that leaves Lasciel. This immortal being was bound in Harry's basement, less than ten feet from Little Chicago.  I realize that she was bound within several circles, but she is a Denerian, and if there is any being in the Dresdenverese that is allowed to cheat, it would be one of them.  This gives her the opportunity, and finally, the motive would be that a Fallen Angel must be voluntarily accepted by the mortal soul.  If Harry cannot function or freely make the choice choice.  If Harry is brain dead, then Lasciel can't take him over, furthermore, his death means that she is trapped for a pretty long time in the subbasement of a paranoid wizard with some pretty heavy wards protecting it. 

Thoughts?

Zolt
I still maintain that Little Chicago fixed itself, shortly after it achieved sentience.

Where do we ever learn that Little Chicago achieves sentience? 

In order for LC to fix itself, as you suggest, then it would stand to reason that Chicago itself has a form of sentience, which I do not think is true.  Highly magical places can have intellectus, and while many boatloads of magic have gone down in Chicago, I think the city is too big for such a thing, and thus by the transitive property that is in play by the small pieces of the larger buildings that are used for Little Chicago, there is now way for the model to gain sentience.

Okay,

So I realize I'm new here, I get that and respect it.

I have noticed that some members have either avatars or display pics that I don't think are part of the menu option, and I can't seem to find a link to link a pic to it on my account page.

So is that something that eventually shows up or reserved for the mods or should I just shut up and deal with it?