interesting take on cnnsi.com....
excerpt (with the full article
here):
"Posey isn't that experienced as a catcher (he was converted in college) and dropping down isn't the ideal way to block the plate. Catchers are usually taught that the best way to block the plate is either to deliver a hit themselves or to be back on the heels, rolling back the way an NBA player takes a charge. The way that Posey set himself put his ankles at risk."