You may want to look at his coverage ratings, because as others have noted in this thread, just because an ATH has a good OVR at CB or FS, doesn't mean he can cover.
I recruited an ATH for one of my dynasties (I forget which team, doesn't matter), and I had a huge hole at CB. My highest returning player was like a 70 something overall, and this ATH came in at the mid 80's at CB. Sweet deal, instant starter! Well, I began to notice that he couldn't cover to save his life, but once the ball was in the air he would make amazing plays on it. The Ath had high 90's SPD and ACC, but NO coverage skills, meaning he led the NCAA is INT's, but also gave up large amounts of yards in the passing game.
He was a blessing and a curse.