Hm. That's weird. You're absolutely right, adding the variable to the set afterward is redundant. However, in my testing, it doesn't seem to add the variable twice anyway, so it shouldn't be a problem in theory. I can't seem to replicate it in my testing no matter what I do. I'm not sure why it would do this for you. It looks like you're playing with Koga's mod, so I can't confirm whether there are any changes in that which would affect this. Either way, this issue shouldn't be present in similar choices past Chapter 3. I guess I never went back and removed the code for the choices before that. I have removed them now though, so future updates should, for sure, be fixed. Sorry for the confusion.