I think Ted is right because of the big talk he has with Robin before the start of the wedding.

I think I have figured out the best endgame for Community.  It all turns out to be a riff on One Flew Over the Cuckoo's Nest and St. Elsewhere.  Greendale has all been a hallucination Abed is actually is a mental patient, Shirley is a nurse, Troy is the janitor, Jeff's the doctor, Britta's a psychiatrist, Dean hands…

I have this theory about "Dean" in my mind I think it's Sam one of the times he was away from Dean trying to live a normal life, and he referred to himself by his brother's name.