They told us Eurus, Redbeard, and Sherlock were all the same person in TAB
Do you remember the part where Sherlock drags his friends to Ricoletti’s grave and we think it’s real, but it’s actually mind palace?
The grave stone says “Emelia Ricoletti, Beloved Sister”
Sherlock jumps in and starts panting like a dog. He shovels dirt with his hands, digging like a hound with paws.
Sherlock is all three people.
“My husband is three people”
The Final Problem makes sense only in subtext. Whether you think it’s John’s MP or Sherlock’s MP, that’s still up for debate. I’m officially siding with Sherlock’s because there are flashbacks to the waterfall scene from TAB in TFP, which means both of those episodes must have been experienced by the same character, and I don’t think it was John for both.
Sherlock DID have a friend named Victor Trevor, but his death happened much later in Sherlock’s life. Because of that Sherlock took to hard drugs as a young adult, not as a child. There are two separate deaths he combined together to create TFP.
Redbeard was an imaginary friend. Sherlock didn’t have friends, we know this. He wanted to be a pirate – Mycroft remembers and misses that carefree child.
So what changed Sherlock’s mind? Why did the cold, logical, calculating machine take over and get rid of Sherlock’s imaginary friend?
Mycroft. He kept calling Sherlock “a stupid little boy”, saying “you always were so stupid”. Sherlock even says Mycroft thought he was an idiot. Sherlock stopped being “stupid” and tried to emulate his big brother – the only person in his life that would tolerate him. He tried solving the Carl Powers case and boom! Sherlock Holmes the little detective was born. This is why Mycroft brought up Redbeard at the wedding – “Hey, don’t get involved, remember when you had to resort to imaginary friends like a pathetic little child?” makes a lot more sense than “Hey, don’t get involved, remember your dead friend Victor who disappeared because our secret sister killed him?”.
Eurus represents the crushing logic that destroys everything Sherlock loves.
Because it’s happened before. Twice we’ve seen Sherlock’s mind explain how Victor died, we just didn’t know it.