Menelik Watson's test results while running around in gym shorts do not match up with what he did on the football field, nor do they match up with a steady stream of testimony from coaches and fellow players about things he's been able to do on the practice field.
When those things don't match up, I'm going to default to the football field. Good example of this is Travis Johnson of San Jose State. I sat there not 20 feet away him participating in defensive line drills during Shrine week. I saw him every single snap thrust off the snap instantaneously a full step farther than every single other defensive lineman on the West squad. I've seen his get-off as up close as you're going to get. He may be small, he may lack the strength needed to be a significant pass rusher at the next level, but his take-off is not in dispute. Both the tape and his practice performance bear that out.
But if you're just looking on a piece of paper you see 4.86 in the 40 yard dash with a 1.66 in the 10 yard split, and a 9'00" broad jump. Only one outside linebacker at the NFL Combine had a worse 10 yard split. Very few defensive ends had a significantly worse 10 yard split. No outside linebacker or defensive end had a worse broad jump.
Some guys the gym shorts performances don't tell you much about. I think Menelik Watson is one of them.