Yup. That's a good indicator of disability. My son is 3 SD between his VCI and his PSI. I've seen a lot of gifted kids with this kind of span. I received the same explanation when I was younger given that my scores were all over the place on the WAIS and Ravens. I've seen kids with FSIQ of 140 and a PSI in the high 80s. You should be able to take your VCI and PRI and get a composite score called your GAI, which correlates stronger with G than FSIQ when there's disability. IQ is measuring something that correlates with life outcomes. It is called G. It is not necessarily intelligence, nor does it indicate that it is a causative agent for life outcomes, only that there is a strong correlation. The old ASVABs and SATs used to correlate strongly with 'G' as well. VCI and PRI are the back of the brain, and WMI and PSI are the very front. It is the front of the brain that makes us human. It is why ADHD and other frontal brain disorders are in reality drastically life altering. People don't realize just how bad of a disability ADHD is.