I'm worried about Duke too, but I take comfort in what PJ said about Duke: “They’ve seen this offense a lot. It’s going to help them. I’ve also seen them. I think it’ll help me.”
With no disrespect intended to Navy, this offense isn't just a magic wand you can wave. It's a living breathing thing. The guy designing the gameplan before the game and calling the plays from the sideline makes a difference just as much as the talent on the field does. We are significantly better than Navy in both categories.
Duke could beat us, and I'm as cautious as any Tech fan about expecting a win, but I wouldn't worry too much about being held to 1.7 ypc in either half of the game. If they beat us, they'll have to keep up their 30+ ppg and create some turnovers.