blackcat - could another factor just be, I guess I would call it "social maturity" with the passage of 1.5 years? DS took the WISC at just-turned-8, and again two years later. He was highly resistant to reading when younger, and had only just begun reading for fun around the time of his first assessment. He also has a lot difficulty talking about emotions and how he feels about things. So we weren't much surprised when the first assessment showed "practical social reasoning" (comprehension) at 50th percentile, nor that two years of voracious reading later, it had increased to 91st. Overall, his VCI increased from 95th to 99.6th - suggesting he might have had the same results as your DS under similar circumstances (but blooming that much later!)
I see I lot of my DS in many of your posts, so I thought I'd pass this on. A lot seems to be able to change in a couple of years, especially if he was only 6 at the assessment.
