Wow thank you all! Kai that is fascinating. Wish my tester had known that.
I did google (duh! thanks polar) and all the scales that tanked for him involved copying something or scanning a pic for info. All of this would involve lots of focusing for him that we have now seen him struggle with mightily. It explains a lot!
Our tester thought his results were an "under-estimate" already. So we have ceilings (WPPSI is only up to 7yr olds anyway so even beginning at 4 there isn't much "room" to be had there) and a vision issue. Makes me wonder if my HG kiddo is EG or PG... It will be interesting to see the numbers shift and settle after VT and using extended norms.