OK, when we're talking about standard scores, you have to realize that the term "very low" has a technical meaning, usually less than 70! Your son's Verbal score is average. That is a low score for him, but it is not "very low"!
The traditional way to look for a learning disability using these tests is to look for a discrepancy between IQ and a specific subtest score on an academic achievement test like the KTEA, where the subtest score is lower than the IQ. In the limited information you have provided, I do not see any evidence to suggest a learning disability. Most students are better at one academic area than they are others.
I know it's un-American to trust experts ; ) , but I rely on the school psychologists who give these assessments. Sometimes, where there is a significant difference between subtest scores in a cognitive assessment, the psychologist will say that one of the subtest scores is a better summary of cognitive potential than the IQ. If they do not put it in their report, I ask them when we meet. I say, "In your professional opinion, is the full-scale IQ the best measure of this child's cognitive potential?"
