Eh, if you pay attention with the scarecrow, it's probable it's fearbringer, at least by the end... which considering Aurora was infected herself does lend it some parallel. I don't think Maeve sent the fetches though, Mab did it.
Some power points,
1 someone taught Molly to use fear to violate free will
2 Eldest Fetch ate her.and unlike with Wamps, we have Daniel under Harry's sight to confirm they take much bigger bites into the spirit itself.
3 the fetches already have the right mirroring for fearbringer, but are unable to change on their own, Magic, the very forces of creation from a mortal wizard can do that though. The fetches aren't like most of fairy either, they have no solid bodies. This is, I think, by design.
4 the 'or what follows' was a hwwbh joke. My memory is vague, but when Harry hulk's out doesn't he say something to the effect of 'ahh there you are.'? Someone else does the same thing to him later iirc.. calls back to a theory hwwbh imprinted his aura on Harry, when he starts to resemble his mindset they see it.(harry going after Rudolph was a very symbolic/meta instance. He became pure hatred incarnate in that moment.. same as hwwbh)
5 the flash of recognition... Didn't sharky have the same thing or was it someone else?
6 him saying he's served the queen of air and darkness since before human memory.
7 Totally forgot something but I'll put this as a place holder..