Kelly is a West-Coast reciever, he isn't going to be that fast regardless. He is probably going to be more like Dwayne Bowe or D.J. Hackett than anything else.
Sure his slower times hurt his draft stock some, but I still think he is going to be a good player. That being said, I wouldn't want him on the Cowboys. We don't need anymore largebodied recievers, we have plenty of those guys in TO, Witten, Stanback, Hurd, Austin. We need some speed to keep the secondary honest and away from the line of scrimmage more than they already are since Marion Barber really isn't a home-run threat in terms of speed and outside of TO we don't have that element.
Release your inner Cowboy
"You just have to accept that some days you are the pigeon, and some days you are the statue."
"If you want the rainbow, you've gotta put up with the rain - do you know which philosopher said that? Dolly Parton. And people say she's just a big pair of (knockers). "
-David Brent, The Office