In the absence of any other noted concerns regarding reading, I would tend not to reach for dyslexia as an explanation in this case. His phonetic decoding (pseudoword decoding), reading fluency, and spelling scores are quite good, which are the main things I'd be checking for compensated/stealth dyslexia. Writing, on the other hand, might bear some more investigation, as the sentence building score is on the low side compared to his reading skills (though still at the upper end of the Average range). This is also consistent with the hypothesis either of some kind of expressive language concern, or a dysgraphic concern. Are there oral language achievement scores? (Listening comprehension and oral expression)
Regarding his handwriting: if you observe when he writes "just fine", there may be other patterns. For example, depending on the dysgraphic, a student might be able to write beautifully when composing text very slowly, or when copying text, or when writing individual words, but not when composing lengthy or complex analytical or creative writing. Many dysgraphics can spell, write neatly, or generate meaningful language, but not all at the same time.
