I'm fairly confident I can't reverse two syllables.
Do you mean this to assess his writing independent of the mechanics? Him mechanical difficulties are a clear barrier to the content. The only place I'd score him above a 2 (or a generous 3) is in vocabulary and word usage.
When dictating and working off a graphic organizer done with the SLP, I'd put him well into the proficient range for each category.
Hopefully the rest about the AAS details will make more sense when I have it in front of me. We'd certainly start off with just the two of us.
Many, many thanks again.