But that was the right call, in my mind...and very Sherlock to tell the real explanation to the loony no-one will believe, because you can't resist bragging (but don't necessarily want the real explanation out there). And they did show him start to explain all 13, and John shut him down (which is exactly how that would/should/did go down!). I have no problems at all with the "return," just that it got a bit too winky at the audience. The substance was fine. The solution to the mystery was just disappointingly drawn out, is all. That said, it created wonderful moments that are the reason I love the show. "Of course there's an off switch."