When they are blitzing like crazy, the solution isn't always to rely on perfect execution to burn them with a big play in the air, especially in longer developing plays. You can pick and choose those spots. Effective chunks of yardage in the teeth of a blitz will cause it to die down. Shorter passes, quick hitting runs might not be sexy, but they can be effective and also borrow time while giving the defense something to think about. A defense that is pinning their ears back isn't going to stop until there is a reason to. The Packers were a pent-up team that was frustrated after not blitzing much most of the season and they came into this game with the intent to pressure. Early on, we ran fairly well with Barber, but I don't think Garrett's gameplan was changed by the flow of the football game nearly as much as he is stating. I believe he intended to beat the blitz with big plays--confidence crushers. I don't believe he had any intention of trying to go toe-to-toe with them.
Passing more and especially setting yourself up in the shotgun isn't going to do much to change the defensive posture. If throwing was the best way to beat Green Bay, fine. There are better ways to do it than to be so obvious about it. Garrett just tends to get impatient and believes strongly in explosive plays. Most of the time, that creates a higher degree of difficulty to execute them. If it works, great. If not, we will have more games like this until Garrett adjusts or we simply get the perfect execution he appears to crave.