I don't think Jeremy's intent was to blame the ball to the face for Rosario's approach. In general, looking at splits is interesting because we think it is telling us something about a specific change. In this instance a ball to the face seems less arbitrary than say May 1 or June 15. But, there are too many other variables to consider this as the definitive change that resulted in the current version of Rosario. It seems to me the Twins have valued BA above other offensive statistics for a long time. I'm sure that played into Rosario's change as much as anything.