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Rahim Moore, S UCLA
Moore led the nation in interceptions last year with 10, has 14 in his career, and is off to a solid start this year. He is a junior for UCLA, and played great defense in UCLA's route of Texas.
Cameron Heyward, DL Ohio State
His stats aren't compelling enough to make your eyes pop out, but his size is: 6'6, 288 lbs. Heyward is a key component of that great Buckeyes defense, and will be a top 25 draft pick no doubt. He's also notched a sack and an interception on the year to go along with 22 tackles.
Jeremy Beal, DL Oklahoma
Beal is the reason why this list of impact players on defense is so hard to structure. He may leave Oklahoma as the all time sack leader, as he already has 6 on the year. Beal stands at 6'4, and weighs in at about 260. He is another guy that could go top 20 if he finishes up this year like he started it.
Last but not least,
Stephon Gilmore , DB South Carolina
I am patiently waiting for Gilmore to become a household name. His coverage is amazing, as he showed earlier this year in coverage on Alabama's Julio Jones. Kid's just a sophomore, and I look for his leadership to really make an impact next year for the Gamecocks.