idk tho because Eurus killed Victor so then if Victor was John then John would have never existed!<<<no they're not thinking of it literally but in a metaphorical sense. Victor looks so similar to John and must have reminded Sherlock of him.
Hahaha the Doctor's face when he realizes Rose was talking about a cat. <---- what really cracks me up is that he's experimenting with back-combing!<----Also, the cat was ginger. Didn't he want to be ginger?