Yes, I used to think pfft on holding for kicks, however, I think it's a contributor when you watch your kicks go astray on the screen. Definite correlation to if you have a poor kicker holder in place you'll see more of your FG attempts swoop to the left or right of your screen, which is never fun!!!!
It is used in the kick accuracy calculation, but there is no indication in the play-by-play what might have caused the missed kick (since all factors are taken together to generate a probability it's difficult to know which factor might have caused the kick to be no good)
