Researchers at Tel Aviv University and the University of California have identified the reason for some dyslexics having low decoding skills but high reading comprehension. Dyslexics with a high neuron density in the left DLPFC of their frontal brain were still able to read well.

http://www.jewishpress.com/news/on-campus/israeli-scientists-discover-link-between-resilience-to-dyslexia-and-gray-matter/2018/07/25/