The reason why Deon did not put up huge numbers in high school was because of scheme. Columbus runs a 4-4 where he was used as the lone safety and there was a lot of responsibility placed on him in the passing game. The 4th linebacker was really a hybrid safety used near the line in run support, which is a role he was never put in and you could never see his physical style.
Another note - He has had the shoulder issue since high school. He sat out a couple games against inferior teams just to rest it up for bigger games the next week. He still undergoes treatment on it to stay healthy, so I really hope it's not something that hurts him down the line.