thank you for the suggestions everyone!

I have made a list and will be doing some online book shopping this week for him. I will definitely get Mercy Watkins for him to try and Nate the great and perhaps a captain underpants (he loved the few we read together last year from the library).
And George and Martha sounds like win too!
Sweetie - we have the same with the illustrations. as soon as he thinks there are too many words on a page he wants to stop. But really, he read like 4 Fly Guy books in church today and was done before even half of the family meeting was done. he really does need something more now.
I am grateful to read that there is hope of him moving beyond this so thank you for sharing your story!