Reading through their progressions or staying in the pocket under pressure are the two most difficult things to learn for rookie QB's who come from the college spread. Some make it, some don't. Russell Wilson is an extremely smart player and a very hard worker. So his learning curve was much shorter. I don't see Manziel as that type of worker, but only time will tell. The problem is you just don't hear about the Russell Wilson's and Andrew Luck's off field activities. Those players are very smart focused players. Manziel needs to join that club or he won't make it...periodHe'll struggle without the spread offense he had at A&M. They have to turn him in to a Russell Wilson type qb to succeed. Great run game, lot of play action, movement, etc. He'll never survive if he plays like the way he did the first preseason game.