Looking at the top interior DL that would fit our scheme...
Louis Nix III - 6'3, 340lbs - Notre Dame - Doubt he'll be available at #21 and TT isn't mortgaging the draft to get him.
Da'quan Jones - 6'3, 339lbs - Penn State - He will be available at #21 but he has problems with "not going hard every play" which means he's probably 2nd round talent.
Dan McCullers - 6'6", 350lbs - Tennessee - Massive dude...maybe too tall and inflexible.
Shamar Stephen - 6'4", 323lbs - UConn - Might be a tad on the light side, but could get to 330lbs with right program.
Beau Allen - 6'3", 330lbs - Wisconsin - Would definitely be a fan favorite...have not seen him play enough to pass judgement.