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My DS7 has strong technical skills, but his stamina and comprehension lag about 1-2 years behind those skills (and still a few years ahead of first grade)

I certainly agree that these kids are out there. But as you say, if they are strong in decoding but not as strong in comprehension, they will naturally be lower in stamina. They may still be rather gifted in reading, as you point out. But it's like the author has scorn for these children, and finds them almost offputting. frown