"In fact, in terms of styles, there doesn't seem to be any pattern at all to the list. This is an indication that "ability to run better on turf" and "ability to run better on grass" are not really abilities at all. I strongly suspect that simple random chance ordered that list and that it has no predictive value whatsoever. If we re-do this list after the 2000 seasons, it's just as likely to be flipped upside down as stay where it is.
Summing up, I think we have pretty strong evidence here that playing surface should play no role whatsoever in determining which running backs you draft or which ones you start. Turf may give running backs better traction, but it also gives defenders better traction, and apparently it evens out."