there's a vid of Sted smacking Mo Claiborne last year. We got smacked that game, and he got shown up a bit by Tavon Austin, but still managed 8rec 115yds 1td against a pretty good LSU d. He was matched up against Claiborne most of that game....and at the end of the year, Claiborne mentioned him as the best wr he went against.
The reason Tavon grades out higher than Stedman is sheer athletic ability. Tavon is freakishly agile/shifty. It will show up in the combine...I haven't seen a player move as well as he does. Also, Tavon's still fairly new to the WR position. He's played it mostly throughout his collegiate career, but was always a running back in highschool/younger.
As a pure WR, Stedman is way ahead of Tavon. He runs smoother routes, has better hands, and is able to get up and get balls a lot better than Tavon.... and can still do some pretty good things after the catch (pretty mean stiffarm. http://www.youtube.com/watch?v=TmO_zg4wH0E
not the best stiffarm example, but still a pretty funny one). Tavon is more the kind of guy that you give the ball in a bit of space and watch him go.