I think that unless he picks the ball up, moves it out towards his GL at address more than a few inches, or double pumps it, you have nothing. If you don't like what he is doing, tell him and the coach, they will probably seek to rectify the situation, but if he is just getting comfortable and doesn't do any of the above... in my mind, you have nothing. Oh technically you might have something, but that is really looking for nits...
Have you ever played center? virtually impossible to keep the ball at a right angle, "up to the snap" and have any sort of comfort.