So, given her perspective on time, what do you think the odds are on Leanansidhe's Garden still being where we last saw it? How hard would it be for Lea to make a simple path to Demonreach? Could this be even easier than we expected? Just a thought. Call it a WAG if you want, but it's just a musing at this point.

I think it's a matter of preferences/approach, not limited ability.

We know that it's technically possible for "regular people" to learn magic, but without the Sight it's compared to a blind person learning to paint. With a Fallen's knowledge, that can probably be overcome.

But it's probably a lot quicker/easier to turn into a giant monster Ursiel/Magog style, especially for someone who already knows how to fight.

And Harry calls Namshiel "Master of Sorcery". His preferences likely make that something he would offer early on (bring it up even if the host doesn't know it's possible) - not so for Ursiel or Magog.

And we've seen what even a modest talent can get up to with the proper supervision: Butters and Bob. I personally think that if the fallen really wanted to they could get wizard level ability out of anyone they chose to co-pilot... with the proper effort. Effort some don't choose to expend.

Yes, I felt that way in both Peace Talks and Battle Ground.  Rudolph for one, did he just go nuts or why would he kill Murphy in cold blood after she saved everyone by killing the giant?

I honestly don't think it was "in cold blood," I think the massive screw-up just screwed up again. I think it was an accidental shot... This is terrible, and ugly, because it means Murph was a casualty of something so damn small. This should play out in an interesting way, but honestly is pretty ugh. I want to see Rudolph scarred by this, don't Dresden's reaction, but his stupid mistake.

My personal take on Marcone/Namshiel:
Marcone is not a simple host to be "overpowered" and ridden like a car. He is a stronger host more like a horse, he could be "broken" or worked alongside as long as the destination is generally the same. Personally, I think that this will kinda slow burn in the background as Harry and Marcone have to interact and get a bit of a "bro-mance" almost friendly relationship. Then redemption equals death; Marcone will lay down the Coin over loosing control... only to die for the lack of power. I don't know... All I can say for sure is that Harry and Marcone will have to work together more, and somehow we will feel loss over Marcone.

We had some great gems hiding in plain sight. Oddly the quiet and "vague" or not as focused on character bits, but on core perspectives of the character.

"Ohhh! What does this do?"
"Killing isn't elegant or creative. It's not my style..." (Dr Horrible love)
"I've gotten in touch with my inner sociopath"
"I'm not racist, I hate everyone" (character was indeed "racist" everything not human was bad)

An awesome character that was all about cards. Tarot and playing card divination and odd "density magic" to turn small thrown weapons into big hits. (Yes, a card throwing character, they happen a lot in my group) He had some good aspects but the one that will always stand out is: "The Heart of the M***er F***ing Cards, B***h!" Between the utility and entertainment this aspect came up at every turn.

One major point is Bob is supposed to be a Badass with a capital B. Remember as fun and useful these "toy Bobs" are and can be limits make them fun and better fitting. Thematically many things are appropriate:
Scrying/fortune telling items might be a fun venue.
Tomes and rune collections hold information.
Spirits in unique "housing" are going to be popular, I like this idea, just remember each sprit is going to have areas of knowledge.

My two bits:
It has more to do with the target in question and the phone than the actual numbers and tech. Expanded example: I am a tech geek, always on my CPU iPad or iPhone, if asked to characterize me one of these devices might be mentioned. A friend of mine plays with his damn android every instance he is able. I would allow either of us to be tracked, perhaps. My wife on the other hand, forgets her phone when she leaves the house, does not HAVE to have it in the same room as her, and can generally "survive" without it (if that could be called living). Her I would not allow to be tracked like that even if she had the phone on her, it's just not part of her Identity; her True Image.

I would absolutely allow it if someone were to use an aspect that might fit here. Like I have been trying to think of an aspect for a vanilla mortal that is "always online" via a smartphone etc. If the phone is "core" to the character then it's appropriate.