I never noticed that there's now a lucky cat at 221B. Canon!Sherlock does like to keep mementos and trophies from his cases so perhaps that's why it cropped up.

Oh! Very randomly I had a dream last night where I was watching a new episode of Sherlock. The scene that I was watching involved John shouting at Sherlock about a mess he'd left lying around (glass, chemical, ect.) mainly because John worries that Abby would get to them. During the dream the conversation felt totally normal. When I woke up I realized my brain has accepted your Abby!verse as show canon. Well done!