To be clear, I don't think that any of us is saying that he isn't PG, just that you'll probably need a new test to get him into DYS. If you can swing a new test, it may be worth doing once he's 6 or if you want to give a shot with the SB-5 sooner.
Regarding the SB-LM, I know that has been flushed out here before, but the reason that kids get higher scores on it vs more modern tests isn't solely related to the modern tests being poor means of measuring IQ at the tail ends. I agree and have also wondered about how we measure the difference btwn HG and EG and PG when none of these tests was meant to do so, but I don't think that using a 40+ yr old test with outdated norms, Flynn Effect issues as a result, a different SD than most modern tests, a different theory of intelligence than many more recent tests, etc. is the way to do it. I always take those comparison tables of LM scores vs WISC scores with a grain of salt. I'm just not convinced that the higher LM scores are more accurate.
