I have no big advice except to say that Apsie kids can appear very smart because they often have advanced language skills and some have hyperlexia but some are just very very gifted too!
I think you won't be able to tell until you've done an IQ assessment but it sound like you are well informed and it's quite likely your hunch is right.
I feel angry to hear of people putting it down to splinter skills.
We had that too....splinter skills, hyperlexia, autistic savant blah blah blah....
I have no doubt that my son has Aspergers...just as I has no doubt that he is gifted.
He tested above 99.9 percentile, gifted evenly across the board (not a splinter in sight;)). So don't let the naysayers put his amazing gifts down.
