Professor Layton and the Curious Illiteracy

I recently finally played through Professor Layton and the Curious Village. Such a relaxing, fun paced, mentally stimulating game. One thing that puzzled me though is that whenever a note was found Layton would ask Luke to read it aloud to him. That didn't make a lot of sense unless he can't read cursive, or his comprehension abilities are limited. That's really funny to ponder considering he's a master of puzzles.

He says Luke is his apprentice, but I'm betting he's actually around for when Layton can't figure something out, or in this case read notes for him.