Not sure exactly what you are trying to get to the bottom of. . . I will say that is takes all of the scores combined to get a Full Scale IQ. That is why DYS requires both an academic assessment and an IQ.

By "lower" scores in WMI and PSI as you say, a HG child will still score in the Superior range. For us, the difference between all four composite scores is 3.9 percentage points. Not too much hair splitting there.