Fred McGriff spoke about this in ST- Guess I should have listened.
From a hitting standpoint, sometimes Freddie flies open (rotates shoulders toward pitcher) and his hands are exposed to getting hit by pitches. When teams are throwing inside, he makes a little move that exposes his hands (trying to get out of the way of a pitch). If you turn this way (McGriff demonstrates, turns his front shoulder and head toward the catcher) your hands are hidden and you never get hit on your hands. But if you expose them you get hit.
That’s always the sticking point, because teams are going to have to pitch him in at times, because if you keep throwing him away he keeps hitting the ball out of the ballpark. So you have to try to come in. Most of the time when you go back and look at replays, most of the time when he gets hit they’re not trying to throw at him, it's just that the ball is a little bit off the plate, and he exposes his hands and they get hit. It’s probably hard to correct it now at this point. But that’s what happens to him when he gets hit. Because you’ve got to keep him healthy.
If you turn this way (front shoulder flies open) you expose yourself to getting hit in the face, getting hit in the hands, stuff like that. If you turn the correct way, you protect yourself”