12 games, 14 tackles, 0 INT, 5 PBU at OM...
If anything, I think he played himself out of that fourth star at OM. As a DB in 2011, he gave up plenty of TD's. He was a true freshman, so that can be excused, but this past season in Juco I don't think he even started every game at DB. He may turn out good, but he's not a high 4-star DB right now.
Cox proved himself the past 2 seasons much more than Brassell did, including by far outplaying him as a DB on the same team and being named 1st team All-American, yet he's rated lower than Brassell.