Welcome! I joined for the same reasons more than 10 years ago and this site and the people on it were invaluable in helping me help my son through high school and college baseball. Have a great ride.
Dyslexia is tough to deal with and, at some point, if not already, it can become a self-esteem problem. The good news is that with technology there are so many new strategies that can help a person with dyslexia recognize problems and improve reading strategies.
Back in the day, I might have been diagnosed with ADHD. I had such a hard time sitting in class. However, I was straight A's. I always felt that I knew what the teacher was going to teach and could not focus on what they were trying to teach each day. In fact, I had a Health Teacher who came to me one day in class, grabbed me by my neck, and threw me on the ground. He told me that I would never be allowed to sit in his class again. Again, today, there are strategies that your son will have to use if he wants to play.
I have coached a lot of people with learning disabilities. Several have gone on to play in college. There is a level of discipline that will be required of your son in order to get the grades to play. It will help a lot if you and your family can establish routines that meet his needs and gives him structure in order to get his homework completed and prepare for assessments.