1. Yes, these scores cannot be used for DYS. He would need additional subtests (reading fluency, writing samples, writing fluency, calculations, math fluency) administered to obtain qualifying scores for DYS.
2. The brief scores generally track the broad scores reasonably well, but keep in mind that there can be wide variability for scores, even in the same cluster, once you reach the upper extreme, and especially for a very young learner. In his case, the difference between Brief Reading and Broad Reading is a silent reading fluency measure. His decoding skills score much higher than his comprehension skills, which suggests that his fluency would be on the higher end of his own range as well. I wouldn't go so far as to say that he would be quite likely to qualify for DYS on broad achievement measures, as he doesn't have a written expression measure (spelling is a mechanical skill, which may or may not predict his ability to generate complex written language). Fluency (writing speed) is also a factor. The third area, mathematics, is strong in reasoning, but would need to also be strong in calculation skills and, again, fluency.
I don't doubt that he is very bright, but the nature of the broad scores, which are each composed of one mechanical, one reasoning, and one fluency measure, means that a single subtest score isn't always enough to say the broad score will be in that same range.
