Your interpretation is largely correct. Verbal ability is quite high, while nonverbal comes out as MG-ish. The big difference between What's Missing and what you otherwise see on the nonverbal/perceptual portion of cognitive assessments is that it is mainly a measure of visual closure and attention to visual detail, light on the reasoning. On the Wechslers, it's probably most similar to the Picture Completion subtest, which got kicked down to supplementary status when they added tasks with better g loading. OIO is more of a classic fluid reasoning task.
He did the best on the verbal analogies task.
In the 6-11 age group, WM has the lowest loading on g, at a mere .49, while VR has the highest, at a healthy .81. IOW, his very high Verbal Reasoning score is the best representation of his overall intelligence, while his average-ish What's Missing score is the least representative of his overall intelligence.
The memory scores: don't know why they gave them, except that they're part of the complete test? I suppose I could see administering them to try to distinguish kids with exceptional rote memory, but average reasoning ability, from those with actual exceptional reasoning.
