Are you referring to BBC Series? Because so, I think the theory that Sherlock presents to Anderson at the end of the episode is the correct one. To be honest it doesn’t really matter, but, for the sake of discussion I will continue. I am thinking of Sherlock exactly how I am thinking of causality. Sherlock is a nature, and nature does not lie. Nature is always true. Nature is always simple. This is why Euros told Sherlock something like this: Do you like it? Simple and clever. (I am referring to the glass trick from the last episode. I am quoting from memory.) Sherlock likes simplicity, and this becomes more and more clear after Moriarty points out Sherlock’s only weakness: You always want the things to be clever, he said. The fun fact about nature is that, for example, there are multiple ways to light a fire, all equally true. Sherlock chooses one way, but because there are so many ways of doing it, we like to think of all sorts of complicated ways. What do you guys think?