Sorry both sisters have been ill & one needs frankly to be sectioned , Mum's at her wits end & DS is due another developmental assessment tomorrow. This thread is a good topic for a rant.
My personal theory on my DS. Try and stay with me cos I'm a bit stressed so might not explain it too clearly. My Dad was deffo dyspraxic, (inc some of the "social" deficits iyswim), however he was educated in colonial Africa and only came to the UK to attend Oxford. No diagnosis - in those days you just were clumsy with horrific handwriting, & considered eccentric. He had a true photographic memory so not completely NT but smart enough to marry a sensible woman and so his difficulties did not disadvantage him in life. Schooling in Africa was very old fashioned with lots of learning by rote and art as a subject unheard of therefore he never had to be creative to excel iykwim. My Mums side is riddled with arty farty, creative dyslexics. My sister has a very developmental serious neurological condition, not ASD but she's not NT.
On his Dad's side DS has a diagnosed AS Granny (who is a primary teacher so able to give me oodles of advice not available to most Mums), a diagnosed AS father, (graduate engineer) and a diagnosed HFA half brother. However the paternal side were all diagnosed overseas.
Despite that weight of family history and the fact that DS walks, talks and quacks like a duck my PCT has been insanely (imho) resistant to the idea that DS may have AS or ASD. I sat in a meeting last summer where the damn lea EP insisted "he's too intelligent to be on the ASD spectrum" - the senco rolled her eyes too.
When DS was a toddler I would have deffo described DS as one of those "shadows" or ghosts Tony Attwood referred to. Then he started a perfectly ordinary mainstream school and fell apart to such an extent that he regressed. I think that was caused by mental overload.
DS would do brilliantly in a rigid education system like my Dad experienced with no confusing group work, silence apart from the teacher's voice, no sensory overload on the walls and a very structured time table. In today's touchy, feely, caring sharing UK school he's at a massive disadvantage.