Here's a followup on the assessment of Cooper:
"2013 NFL Combine: Bench Press Recap - Offensive Linemen
The most impressive bench press total belongs to North Carolina guard Jonathan Cooper. He weighed in heavier than expected at 311 pounds and apparently that added weight is muscle. Cooper tied for second with the largest number of reps on the bench press with 35. He benefits from having short arms (33 inches) but the strength was impressive to see considering he is known as a blocker who features rare speed and agility. Cooper is helping himself in the early going at the Combine."