O-linemen impressive at NFL combine

Note: All combine times are unofficial until the NFL releases results following the final workouts of the week.

A breakdown of offensive linemen who are standing out during afternoon workouts:

• Iowa OG Adam Gettis continues to have an impressive workout. He posted a 31.5-inch vertical jump and a 9-foot-4 broad jump. The averages for guards over the last four combines are 26.5 and 8-4. California (Pa.) G Rishaw Johnson also posted a 31.5 vertical, and he weighed in 20 pounds heavier than Gettis at 313 pounds.

• Boise State OT Nate Potter stumbled when asked to pull around a guard. Potter has to take a deeper first step and show better balance. He also showed just average foot speed and balance when asked to change to directions quickly.

• Midwestern State G Amini Silatolu looked explosive and showed above average lateral quickness when asked to drop and slide in space. California OT Mitchell Schwartz didn't show the same kind of foot speed, but did display above-average footwork and body control.

• Miami OT Brandon Washington got too much depth and not enough width during kick-step drills. That helped Washington win the race to the corner, but scouts will recognize the flawed technique. Washington would be open to inside moves and or driven back by power moves in a game situation. getting beat inside or driven back by power in a game situation.

• Wisconsin G Kevin Zeitler maintained a wide base and stayed in a balanced position when asked to change directions quickly.

• Georgia OT/G Cordy Glenn is having a strong combine so far, but the 345-pounder propsect had a tough time getting off the ground. Glenn posted a 23.5 vertical and a 7-9 broad jump.