The first paragraph of that article sums up what I've seen every time I've had the chance to see him play:
"Pass Rush/Closing ability/Moves and counter moves: A good college pass rusher, Clayborn would struggle as a right defensive end in the NFL. He lacks the speed, secondary moves and agility to make it as a pass rusher. As a 3-4 defensive end, Clayborn will be asked to stop the run and, depending on the scheme, create pressure on the pocket. Does not show an ability to dip his shoulder or roll his hips to turn the corner- this must be learned. Has yet to develop a secondary move and relies purely on strength as a college player. As a college defensive end he is stronger than most tackles- this will not be the case in the NFL."
I worry about this guy. Man I want an impact player in this year's draft, I really like what I'm seeing from Nick Fairley