At the risk of pulling a Heelswxman talking about playing against Julius Peppers in high school, I'm going to detail my experience facing Jadeveon in HS. He played for Rock Hill South Pointe, and they were one of the teams at a 4-team scrimmage prior to my junior year.
He was the best player I ever faced bar none. He was only a sophomore at the time. First play from scrimmage, he blows up the RT (who would go on to play FCS ball), and is athletic enough to run out and intercept the option pitch and return it for a TD. We didn't go at his side at all the rest of the scrimmage. Even with that, we rolled our QB every passing play away, and chipped with a back/WR and he still harrased our QB. I chipped him one time when I came in motion and I'm not even sure he felt the contact. We were a good team that year too, made it to the 2nd round of the state playoffs, and he just dominated like he was going up against little kids.