Some 4-3 Schemes in college call for a rush end. There aren't too many schemes like this in the NFL. Most D-Lineman are called to take up blockers so the linebackers can make plays. I see Gregory as being more of a playmaker than a guy to set the edge. OLB will utilize his athletic ability and wingspan, and also allow him to pass rush.

Too light for DE

Looks like a great 3-4 OLB prospect. Remember Randy's pick 6? He's athletic enough to cover as well as rush the passer.