I wouldn't have phrased it in the way Zavi has, and I would defend every parent's right for a child to be educated in a MS school, but my heart sang when you said Special School is the next step, DiamondDorris!
My DD1 goes to SS. She is 7. She's probably the most able child in her class. She is more able than many in the school who are in higher years, as she has Moderate Learning Difficulties and her school caters from PMLD-MLD.
The truth is, "However, he occupies the same place on the social hierarchy of the classroom as the rest of the children" just isn't true, because his needs and developmental delays place him in a different zone to the other children, no matter what we would like to think.
In Special School, all the children have needs. DD1 has articulation problems, she has general needs. She's continent by day. Someone else at her school may have perfect speech but be incontinent by day.
The bizarre thing, is that all the children are just who they are there. DD1 says 'oh yea, Wobbie uses signs to talk. Tameron uses words....' Children with SN aren't silly, they just know that 'this is the way this is' and the needs are inconsequential to their day.
At SS my child is independently collecting a register from the office and returning to her classroom. The site is secure, they have CCTV - she can't get lost and she can't escape. At MS she would need a TA by her side, because the site isn't secure.