Ben Roethlisberger isn't going to be challenged by Mason Rudolph. Roethlisberger is the Steelers' quarterback.
But the dynamic between the two at training camp should be interesting to watch. Roethlisberger is as competitive a player as I've been around. During downtime at camp, the players will take part in little games, placing wagers on who will win. It could be standing at a spot on the field and trying to hit the goal post with a throw. It could be trying to throw the ball into a garbage can. It could be anything.