As far as speed it's been reported that Richardson ran 4.6 40 in high school. While I'm sure that's an exaggeration, it is an indication that he is one of the fastest players on the D line. He's very quick. I also believe there was some talk of possibly putting him in at FB in goal line situations when he first got here. Speed measurables should enhance his score. He's a stud in the weight room with a 455 max bench and 585 max squat according to Rivals
http://sports.yahoo.com/ncaa/football/recruiting/player-Steven-Richardson-147971.
By comparison, the site gave Stelter a 5.0 score even though reported speed and power measurables fall short of Richardson's. The only explanation for the discrepancy that I can come up with is that it shows Stelter excelling at shotput and discus in hs track while Richardson did not. The site seems to put an emphasis on track and field performance in its calculations. It's ludicrous to watch these two on the field and conclude that Stelter is a significantly better athlete. IMO Richardson is the better athlete. It seems liked flawed data is used to compile the scores.
BTW: The content is in a free section of the site for anyone who wants to register and check it out.