From the Athletic article you posted there may be a tell tell sign from his DL coach. When he was asked about Carter's vertical and bench press, he said (paraphrased), Jalen could jump mid 30s, if he wants to. Jalen could bench 40+ times if he wants, 50+ times if he wants to. Which now makes me wonder does Carter have A Want To problem? Seems he may or why would his coach mention it? I was against drafting Clowney based on Spurrier's comments. The same holds true for Carter.
I've never raced but in my youth I have been behind the wheel a few times seeing how fast the automobile would go.