The distinction between Autism, Bi-Polar Disorder, Schizophrenia, OCD, ADHD and Borderline Personality Disorder is not clear-cut.
There's a significant overlap in symptoms and genetic correlation between each of these "disorders". Co-morbidity is also very common.
Personally, I lean towards the notion that Autism, Bi-Polar Disorder, Schizophrenia, OCD, ADHD and Borderline Personality Disorder are not individual conditions but as different expressions of the same spectrum.
I would also argue that these are not disorders, but normal variations within human behavior that have been pathologized for no other reason but the rather eccentric and unusual behavior of people within, which makes them more difficult to manipulate and control.