Yes many times it is the shoulder.......................with Piazza as well. Actually more often than not Piazza hits his shoulder. I looked at many Piazza swings and never saw one similar to what was posted here. They all were shoulder hits with little to no back contact. Definitely not the big thudding hits to the square of the back that were the subject of this thread.
Bottom line is IF an Elite hitter does it, it's a definite outlier. You can't bank on outliers.
Bottom line is IF an Elite hitter does it, it's a definite outlier. You can't bank on outliers.