Oooh, yes, that could very well be! I want it to be human Osgood who survives, but of course we were never told that Zygon!Osgood disappeared after the 50th special, so she could very well still be hanging about. I've seen that plot point used to good effect in fic and I can see canon doing something with it.

(On a similar note, I've always wondered what became of Ganger!Eleven. They never did say, did they?)

I almost never write either a) one story by itself or b) a story from start to finish. I skip around a LOT. :D