The conversation between human and AI assistant.
Is it realistic that Sherlock does not know the identity of one of the characters?
That's true. But I feel like Sherlock should be able to figure things out, even with someone trying to deceive him.
It's important to keep in mind that Sherlock is not infallible and can make mistakes. Additionally, there could be information or clues that are not immediately visible to him, and it may take some time for him to piece everything together.