Agnew DS3 is like that also
Yes he is bright and when he can access MS lessons can understand them
Only, slowly but surely he can access them less and less as he slips into another world.
I have little idea how he will end up- he has become mroe severe in many ways in the last year and has gone from accessing MS with help (in a general SN Base) to not being able to and paed even suggested the more severe ASD Unit (no, he is happy and school are happy so we are happy).
Interesting thing though- when he was diagnosed he would not have fit the new criteria yet he has clearly followed an ASD developmental path and it is clear as day now. it took the 3Di to dx him originally as he presented differently, would take a ransom person who saw rainman once I think now.