Of course he's not stupid, the the complete opposite, a genius. His extraordinary abilities with numbers and memorization clearly indicate
he's a smart man. When his brother asked him how he solves complex
math problems so quickly in his head, Raymond said he "sees it". He
didn't know what he meant by that, but I know what he means.

I believe that Asperger's which I was diagnosed with can turn into a
combo with another condition or evolve into another completely.
One characteristic of Asperger's is that one has limited interests, and
is intensely taking part of those few interests. With me, sometimes
I still like those things, but have periods of energy loss, and a lack
of taking part in those interests. This is why I think that clinical depression may be involved, too. I'll probably mention that to my
new therapist. My previous one was listening more to my family members's reports. Which is why he thought that it may have been P.S.