This is not all that unusual. May I ask which reading scores were concerns, and what they were? That might tell us a little about the nature of the reading discrepancy. ADHD can also affect reading, even in the absence of dyslexia.
As to therapy and tutoring for a child in the highest reading group: the question is not how well he is doing compared to other children, but how well he is doing compared to himself, and whether there are factors amenable to remediation that may be interfering with the full expression and development of his gifts (which includes, for example, how an aversion to reading affects access to high-level vocabulary, writing models, information, inferential thinking, and professions that he might be otherwise interested in, that require high volumes of reading). He is also only 9. At this age, any downstream impacts from reading deficiencies are probably being masked by his other abilities (especially in oral language). I have seen many, many dyslexic students for whom performance in the language areas of cognitive assessments has fallen gradually over the years, because their access to reading vocabulary at their cognitive level is restricted by subtle or blatant reading deficits. More importantly, most children are aware (or become aware) that reading-related tasks "should" come more easily to them than they do, which creates and perpetuates a negative self-concept with regard to their learning ability and motivation. You may not see the effects of not remediating until several years have passed.
