If you're comparing how much they had to deal with that was the same, let's look at one key difference: number of practice reps with the first team. That's a factor as well, and Jameis was starting to warm up that last drive, which was no small feat with that offensive line.
I'd rather have Carr in there, no doubt. But Jameis went in and performed as most backup QB's would do who are thrown into the game due to an injury to the starter; it takes time to get into the rhythm, especially when the O-line is not allowing much of a rhythm to happen. I don't think he deserves any blame in this one, quite frankly. Now after a week with starter reps, then I expect more. But this week, no.