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I guess it sort of depends on the era. If James hasn't watched football in ~20-30 years, he might not have been so far off the mark. It is pretty incredible how players have gotten so big and yet faster and more athletic simultaneously.
Reminds me of a play I saw in person in the early 2000s. I was in the 2nd row on the 1B side. Olerud was playing 1B, and a pop-up came over our way, just a little out of my reach into the first row. I was looking up, and the ball was in the air only a few seconds. As I was looking up, I heard a loud wham- Olerud crashing into something (I think it was the ground tarp) to get to the ball. For a "big slow" guy, he covered an unbelievable amount of ground in no time. I was pretty amazed.