When reading about someone on the OALD, I saw the following note: The difference between someone and anyone is the same as the difference between some and any. Look at the notes there. The note t...

Understanding the Context

My experience with loop someone in doesn't mean involving them in a particular physical discussion - it means adding them to the the group of people who share a piece of knowledge or are contributing to a body of work. So "loop someone into chatting" doesn't work; "loop someone into a discussion" only works when "discussion" means an ongoing and intermittent discussion.