Interesting about drawing and filling it in himself, helping him learn. They do a lot of that at Montessori schools. As opposed to lecture -> note -> memorize -> regurgitate. It's a different way of encoding the information. I knew people in college who relentlessly "re-copied" their notes. Yes, they re-wrote their already hand-written notes. I thought they were crazy but that's how they learned. Mostly biology majors -- folks who had to memorize long lists of things, and all the taxonomies and classifications. I never could deal with any of that stuff, but I can see the comparison with a complicated NFL playbook.

It's not like he's learning some easy system -- the Ravens have a highly evolved defense that is difficult for opponents to figure out -- it stands to reason then it's also hard to learn.