Well it's a moot point with Ronaldo in the team as he prefers the left. I think Costa is ok on the right side if there is a RB behind him to take all that space that opens when he cuts inside.
Great first half. Disgusting 2nd half. Good defensive sub in the last 15 minutes to hold 3 points.
Hard to say what the match would have looked like if Ronaldo's 2nd goal counted. Probably would end 4-0.