In TAB John believes in TJLC, Sherlock does not. But, John is always right.

Reading this post by @221beestings about twins in TAB vs triplets in TSoT got me to thinking about the triplets as mirrors for the John/Sherock/Mary love triangle. If the triplets, like the, ‘three people’, this client thinks her husband is, are meant to reference them then who could, ‘twins’, be referencing in TAB? Well, in the end we see that, ‘there’s always the two of us, don’t you read the Strand?’. So, twins = John and Sherlock and triplets = John/Sherlock/Mary. AKA one is Johnlock one is not-Johnlock.

So, John insists that it could be twins in TAB. John insists that the show could end up with them together. Sherlock thinks it’s never that. Maybe it’s never been that, as in, they’ve never done an adaptation of Sherlock Holmes where that officially happened.

Despite Sherlock’s mockery John insists and further explains, ‘maybe it was a secret twin’. Not just Johnlock but secret Johnlock. Sherlock thinks that it’s absurd to think that this would have been planned since, ‘conception’. Like, it’s absurd to think that the show has been about Johnlock since its conception. Sherlock is saying that it’s never canon Johnlock, and that TJLC sounds absurd to him,

But, in the end it is always the two of them and furthermore, by his own admission, John is always right. This means that John is saying, ‘this show will end up with us together, it’s an obvious conclusion’, and Sherlock is mocking the idea because it would’ve required a plan since the beginning. And yet, John is right, he’s always right.

John believes in TJLC, Sherlock mocks it. Sherlock realises John is right,

In the end there was a conspiracy and John, Sherlock and Mary must walk through rooms full of fire (symbolising desire) just to arrive at its heart. In the end it’s Mary who leads us to see that there really was a conspiracy. Mary being there as John’s romantic false lead is the final obstacle to Johnlock,

If the answer that solves a case can easily be triplets then it can also easily be twins (the latter being statistically more common). If Sherlock can accept that Mary is in the way of his happiness, maybe he can accept the opposite is an option, too: that he will get what he wants, that he and John will be together.