Highsmith is not that much smaller then some of the top tacklers in the NFL and all are middle LBs.
1" 10lbs. lighter the Pat Willis
Same Height and 8lbs lighter then Jon Beason
2" and 3lbs. lighter the Nick Barnett
1" and 8lbs lighter the Demeco Ryans
You know how easy it is for a player to put on 10lbs in a pro strength and conditioning program.