So, I think I've developed an unhealthy habit of reading too much into things, especially when it comes to names and initials. I'm perfectly convinced that Eric Draven's initials are a reference to another wonderful revenge-driven character, the Count of Montecristo, aka Edmond Dantès...and both happen to have a "nickname" starting with C (the Crow, the Count...).
I was working on a possible new Sherlock fic, and I noticed that Molly and Mycroft share the same initials, namely MH. Obvious, right? Too obvious, even. So obvious I got through 6 episodes and long days spent in fandom without noticing it.
Well, what if it's not just a coincidence but a clever clue (fun with alliteration, yay)?
Think about it: in canon the only person who knows that Sherlock is not actually dead is his brother Mycroft. In TRF we are lead to think that Sherlock has asked Molly's help for his plan. Whatever he did to fake his death, it's pretty much obvious that he needed her help. So, we can assume that Molly Hooper knows that Sherlock is not dead. (We are still not sure whether Mycroft knows or not, but it's not really relevant here.) In short, both in canon and in the BBC series we have only a certain MH who knows what Sherlock did. I know it is a theory that does not explain anything at all, but I just wanted to share it. I think it's interesting because it seems to explain Molly's presence. She is probably the only important character in the series who has no counterpart in canon, the choice of her name might have been influenced by the role she had to play, and both in canon and in the series, help is provided by a character with MH as initials.
Ok, you can call the asylum now.