I don't think learning about football will do Zach any good. He knows the game, he's not like Manziel who never studied. His problem is his brain is too slow in live game action, and I don't know how you can simulate that without putting him in games, not that that's helping either. Maybe go the CFL or something where he can play games at a slower speed and then try to get back into the NFL?
Also fun fact: Zach has the lowest TD percentage of any QB in NFL history with at least 900 pass attempts.