No, Jeff Roe would have just stepped up the attacks.
What was really stupid was when Newt said he was going to run a positive campaign and allowed himself to be carpet bombed out of the race.
If Jeff Roe decided to do that it would make Cruz look very bad indeed. Instead Trump tweeted a picture of Heidi Cruz ( who is not a supermodel) next to Melania implying that she is ugly... making Trump look pretty shallow. It was bad optics for Trump who could have made Cruz look like the low life.