We all know it's Andrew, but he just doesn't want to admit it yet because when some of us assumed it was him he started doing that thing where he demands evidence for no reason. So I guess he doesn't want to make us be right just out of spite.
Andrew has always had trouble understanding sarcasm (although he was one of the few to think Richard's IRA memes were sarcastic). But I think he just pretends to have no common sense just to frustrate ppl