galithor and i awhile back were testing the effect of quickness on combine scores and quickness was a tiny factor for the 40-yard dash. But it's mainly sprinting. Weather or not the combine is just a cosmetic tool or some hint at the actual game factors, no one knows. But I've been using it as a start for further testing, and quickness in my opinion gets you going. Generally traits and abilities are give aways as well, and 1st step is powered by quickness. Just sayn'.