He is undersized for a guard but that doesn't matter as much at center. There was a reason they drafted Ruiz to take over at center. McCoy was struggling with the calls at the line as a rookie and they wanted to bring in someone to make the calls at the line of scrimmage. Because of the Covid shortened preseason McCoy stayed at center and thrived in his second year. However, This TC we may see if Ruiz is better at center. Personally, I'd rather see the team kick McCoy out to center and let Ruiz play his natural position snapping the ball.