I agree with you here, tbh. I believe the anagram of her name and the leftover H thing is another red-herring clue left by Jed just to keep us diehards on our toes. But it makes for a good wow reaction or two, which is precisely what he's after.
This is a very good spot indeed. Marcus Thurwell is played by James Nesbitt, who is not, as far as I'm aware, a 'bit player' actor. He's usually frontline. Now, that doesn't mean a thing (there have been a lot of top class actors in supporting roles in LOD), but it would imply that there is more to Thurwell than meets the eye, possibly. The actor also lied about being in the show - which was part of a plot to throw people off the scent. This was when Thurwell was under suspicion for involvement in the cover-up of the Sands View abuse case, and he managed to retire and get away after the investigation into Fairbanks took prime focus. He is definately a loose end and therefore one to watch, imho.