If you've never done it, shotgun snapping isn't as easy as it looks when you have a guy lined up on you or have gap assignment and have to get the snap off and beat a defender to a spot. These are college level DL also that are (typically) very disciplined to move on ball movement with quickness and explosiveness. It's hard enough for guys that haven't done it in several years, and all likely against high school level competition only. We will certainly come to learn that a veteran center is a high commodity.