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Tyrann Mathieu is one of those guys that, on paper, shouldn't be good, but he is.
Mathieu is famous as a dynamic punt returner. Last season, he returned 27 punts for 421 yards and two touchdowns. Even better, those two touchdowns came at times when the LSU offense needed a big push.
What people forget is that Mathieu is also a really good corner. As undersized as he is (5'9" and 175 lbs), he is as tenacious as...well...a honey badger. He makes plays in all kinds of ways all over the field, and plays like he's 20 lbs heavier than he is.
In 2011, Mathieu had 76 total tackles (59 solo), 7.5 tackles for loss, 1.5 sacks, three quarterback hurries, six forced fumbles and two interceptions. By the way, he recovered four of those forced fumbles, and returned two of them for a touchdown.
Between Mathieu, Mingo and Montgomery, LSU's defense ought to still be very good next year, even without Morris Claiborne and Michael Brockers.