In ALL statistical studies or modeling where there is any repeated measure on a variable in the model there will exist an error term...that is some difference between "values" being measured under what is declared under a certain condition. Many times that error is not only measurement error, but unknown variable or variables NOT measured. This is true for Braden...not all his value can be calculated due to only those metrics measured, such as grit, intelligent play, leadership, control of the game, being in the middle of the action continuously and