Well, I wouldn't say that the term 'constant' is fair, as this was the first truly bad throw of the preseason for AJ. I still think it was an awful game, though. It's just that, even with AJ's pick, he has roughly the same QB rating as Gus! And the rating doesn't even take into account Gus' fumbles, including a return for a TD (a "bounce 6"?).
Looking at the stats, even if you give Gus another 6 completions for all the drops he had in that one game, he still isn't completing even 50% of his passes. And he knows the system!