I've seen enough analysis and All-22 film from analysts that consistently question the routes being run in the passing game to think there's more to it than just Hurts. AJ, Devonta, and Dallas didn't forget how to run routes correctly. They are running what's drawn up, and the schemes just aren't working to get them open or (quickly) in position to make something happen.
It’s the sum of many parts. Hurts is a single read QB who struggles with zone defenses. So when you see guys breaking down tape and looking for a 2nd, 3rd or 4th option most times it’s irrelevant. He’s reading the defense pre snap and most times going to who he thinks will have the coverage he desires.
Many, many times he has underneath guys but he doesn’t seem to process quick enough to get to them timely. There was a LOT of them open this past weekend.
Any OC would be limited with him which is why you see a lot of the same complaints under 3 NFL OC’s and various college ones as well. With all that said he’s obviously good enough to win big games but this is the ideal offense for him.