That wouldn't be such a bad idea, he's not the fastest guy, but he really overpowers the O-lineman. Someone like him coming in from teh backside must get the QB worried. Especially after a couple of sacks.
Maybe they want him on the LE so the QB can see him coming? I know it sound weird, but a QB will get rid of the ball, before he would be sacked. That would mean the QB has to get rid of the ball, at least a second before Kampman gets there in most cases.