I know exactly how you feel!!
Si was savant like in music and had an amazing perfect pitch when he was little. He has a photographic memory literally. His literality was a big problem - he wasn't rude when someone asked a sarcastic question but was deemed so when he answered literally.
My dad: "how were your meatballs Simon?" Si: "I didn't like them, they were awful Grandad!"
He had (and still has) a natural affinity for animals - they love him and he loves them.
I wept when in high school my son's report said that [I]he would give the shirt off his back to his worst enemy if he felt they needed it more than he did". This was so pure but not a survivable attribute - yet he did and is an incredibly compassionate man.
You are fortunate your son will have help from day one