I seem to recall reading he ran a 4.3X 40 in one or maybe two of the camps.
He isn't that fast, he would have looked fast regardless of who he is playing against. I would guess he would be in the 4.45 range to 4.55 range which is very fast. All these sub 4.4 times by 16-17 year olds just don't happen. The NFL combine would be a good indication of that where athletes have paid personal coaches to improve their starts and form to specifically improve their 40 times and a sub 4.4 is still rare by the cream of the crop.