He would not reach their speed at distances relevant to a football field. His specialty in track was 400 meters. He was a state champ both his jr and sr years. He had the 6th best time in the 100m. I don't think there are 6 guys of the same age in the state of Oregon that run as fast as Rocket did.
He has terrific speed, maybe the fastest on the current roster, and can get even faster with the right training. With that kind of training, especially, as you point out, his explosiveness, he could get to the level of Will Fuller. Fuller even acknowledges that he was not nearly as fast coming out of HS as after working with the strength and conditioning program at ND.
Rocket was just at a whole different level.