Human nature will always interfere with the best laid plans of a well constructed roster. The behavior of a player behind the scenes may cost him starts or maybe his personality just rubs the manager the wrong way. Maybe the manager has nothing against him personally, but when it comes time to put a player’s name in the lineup, oh look I don’t really want to sit this other guy. Then of course, there’s the unpredictable hot streaks and cold streaks that will screw up plans. A manager can have the intention of starting a player 10 times in a month, but if the guy he’s competing with rattles off five homers, he’s probably not getting 10 starts that month.