I guess you can say that everyone knows that both Roethlisberger and Leftwich will start games at some point over the course of the season. The same can't be said for Leinart/Anderson. When putting the list together, that situation wasn't completely clear, so he combines them. But in the big picture, the vast majority of the readers are going to stop reading at the halfway mark, if they even make it that far. No one cares about the bottom feeders, which Arizona clearly has with either QB. Roethlisberger, being a big name that many people are looking for is going to get his own mentioning in the portion of the article that people will actually read. Drop him down half with into a combo with Leftwich and all of a sudden people never even see his name.