There are reasons to think he 'could be' better, there is no reason to think he 'will be' better. There is a difference. I don't think one solution is a lock over the other, especially not to the point to say the manager is failing by making one decision over the other. That's a good enough reason to at least give Green a couple of starts per week. No one knows if Green will outperform McGehee for the remainder of the year, or even if Green will end up being a legitimate major league player, but with the way McGehee has underperformed this year and with the numbers Green has put up in the minors, why shouldn't RR give Green a few starts per week?