Rivers is a big guard who is very lumbered with his movements. The position drills at the Combine focus on footwork and movement skills, which isn’t his forte. He's a phone-booth mauling-type guard ...

The 10-yard split, times from the start of the 40-yard dash, shows a prospect’s burst and acceleration off the line of scrimmage. The three-cone drill measures a prospect’s agility by testing ...