From Scout.com:
"McKelvin has a good body type, and the frame to add a few pounds. At the Combine, he showed off his straight line speed, running a sub 4.4 while displaying the ability to stop and start without losing speed, and the ability to maintain top end speed. Best suited for a Cover-2 scheme. A fluid athlete and dynamic game-breaker when he gets his hands on the football as evidenced by his seven TDs (five punt returns, one kick return, one interception return)."