The same position Jevon Kearse played at 6'6" 260 lbs? Daytime Jones at 6'4" 270? Pernell McPhee at 6'3" 270 lbs? Cliff Avril at 6'3" 260lbs? Elvis Dumervil? Dwight Freeney?
IIRC, all of these guys entered the NFL with concerns about their size. They added weight, strength, etc as necessary. If you can get to the QB, you aren't going to let a little thing like 20 lbs stop you from being successful in the NFL. He's a young kid still, too. His body will continue to develop in the next few years.