I'm not sure it's significantly more a Fae formulation than wizards use in general, though, cf Harry setting three conditions on his agreement to become Winter Knight in Changes, or the questions he gets from Lea in GS. (I kind of tend not to notice that as a Fae-specific thing because it's not exceedingly rare to find that sort of pattern in spoken English in Celtic countries, it was the sort of thing people around me when I was growing up might plausibly say.)
Yeah, but in both those circumstances Harry is speaking with the Fae and so consciously adopting their lingo -- it's not something Harry just does when he's talking to, say, Kincaid, or Ebenezer, or Mavra. So I think it's a tipoff. Is there anywhere else in the series where we get that formulation and there isn't a Fae in the conversation?
That argument seems to me to contain the assumption that Earthly geography maps consistently into the NN, and I think the evidence in the books argues otherwise; in GP Harry gets into Bianca's house from fairly close to where Michael and Thomas leave the NN, but they end up in a strip club because Thomas has an affinity for such places; in WN the two portals opened into the Deeps in the final battle lead to wildly different parts of the NN.
Yeah, that's the assumption, or at least one possible assumption. The way I've read the books so far, there is a 1:1 map between Dresden's Prime Material Plane and the NeverNever -- it's just that there's a wild variation over distance, i.e, even moving an inch in 'reality" might take you to a wildly different place in the NN. The main evidence for such a 1:1 map would seem to be the possibilty of guarding things from the NN side -- i.e., Lea's Garden, the Nazi Ghost Beach, etc. The other evidence would be the relative stability of Ways through the NeverNever -- You can't just wish up a spot near you that will take you to X place, you have to find a spot near you that opens up into a spot that's near the spot you want to get to in the NN, etc. Without some degree of stable correspondence and mapping, Harry's mother's amulet is an unnecessary waste -- you could just hop straight to wherever you wanted to go.
The way I read the passage with Thomas and Michael, they'd had to travel to a spot where there was a corresponding spot that Thomas had an affinity (the strip club). But I admit it's open to interpretation.
I'm inclined to disagree here too, both because halfway through the series does not seem too late to be introducing major players to me, and because having Sidhe-type Faerie seems to me to automatically imply something Fomorian-like as part of the same mythos so they've been implicitly set up since GP; it's no more bad plotting to my mind than not introducing angels loyal to Heaven until halfway through the series if there were explicitly Christian-mythos fallen angels several books earlier.
Fair point, but one that might seem stronger to someone raised in Celtic lore. For us ignorant Americans the Fomor are pretty darn esoteric -- most modern fantasy that talks about the Fae doesn't talk about the Fomor (Tolkien, Gaiman, Susannah Clarke, etc.).