There is no reason to contrive some complicated predictor of performance based on complicated measures of physical parameters and the assumption that we know what combination of physical traits will or will not relate to elite performance. We can see and measure performance directly on the ice, the field, or the diamond. Moneyball isn’t about physical traits or characteristics….it the opposite. Its based only on performance. The idea of moneyball is to throw out the complicated predictors based on physical attributes that MIGHT lead to a great performer, and just find the great performers based on, of all the crazy things, their actual performance.