Re: I have always seen Carr's path to the Heisman as difficult..
You also should mention his 0.8% sacks per dropback. That is phenomenal, and not merely a product of a stout O-line. Pair it with a 4.3% sacks-per-pressure rate and you have pretty strong evidence that Carr is exceptional at preventing pressure from becoming a negative play.
That does not prove exactly how much comes from pre-snap recognition versus post-snap processing, but it certainly supports the broader point: he is seeing things early, getting into favorable plays, and getting the ball out before trouble develops.
The difficulty for Heisman voters is that this is mostly invisible. They can see the one interception, the third- and fourth-down efficiency, and the team success, but they cannot easily see the bad plays that never happened because Carr recognized them before the snap.