Is there any doubt Ronaldo would dominate rugby like he does soccer?

With his pace and upper body strength he'd be out on the wing scoring a minimum of a try a game.

He'd most likely be the designated kicker scoring all the penalty goals.

As a conservative estimate I'd see him averaging 15 to 20 points a game at test level and more at club level.

He'd easily be the greatest player to ever play the gentleman's game.