Hard for me to fault Mussina, I know it's not popular opinion, but he gave the team a very friendly 3 year deal for 7M per, despite the players union not being happy about that, then the Yankees offered him 10.5M more in total value. Both teams were trending in different directions and I don't expect a guy to be completely loyal, when you've already given the team you are on a really friendly deal then they low-ball you for the big contract. Plus, they want to win Championships, despite him not winning one, he did get to play for some in the WS and that is what most players want, to win.