My thought has been if the catcher has more arm than she does lower body quickness, maybe the throw from the knees makes sense. If someone does it effectively with a great pop time I don't think I'd try to change it in her late teens or later. Santiago did it that way in the majors and of course we've seen examples in fp. I would think it would make more sense in fp than in bb. Given the shorter throw I would think a quick release would gain a little more importance relative to velocity in fp vs bb? The Ballplayers - Benito Santiago | BaseballLibrary.com