I'm guessing the move was based on matchups. I think one of the changes that the team has made this year is to not have relievers warm up and sit back down ... so it's pretty much assured that if a pitcher gets up and starts warming, he is coming in, and likely with a specific hitter in mind to face. While that philosophy does lead to some shorter starts, it's working, so I'm not going to question it too awfully hard. I agree that it's worked. Just seemed really odd given the size of the lead.