His 2006 season netted him 17 wins because he had hands-down the best offense in the game behind him. As of now, they're rotation consists of Mussina, Pettitte, Wang, Johnson, and Pavano. It's a strong 1-3, but if they could net a decent #4 pitcher who isn't facing the injury risks and performance decline Johnson is, or if they feel that Jeff Karstens is ready to start full-time, all while getting rid of his $15M+ contract, it's a no-brainer on their part. IF Johnson is healthy theres a very very good chance he will be the #1 pitcher in that rotation. Nate Silver agrees.