I don't see him as a DE at all. He just doesn't have the speed to threaten the outside, so NFL tackles can just sit down on his bull rush and inside moves.
I think he has some pass rushing potential at 3T... strong, quick first step, and knows how to get skinny. 6'5" 270 is a terrible build for a tackle though. On run plays, he is giving up 40-50 pounds in the wrestling match and doesn't have good leverage.
He is the spitting image of Crawford IMO... Crawford had a long and successful career as a 3rd round tweener, but we drafted another tweener in the same round and reached big time for Golston. I guess we make the two compete in a Crawford-off for snaps or something.
Either way, I would have picked only one of the two and packaged a 2+3 to get a 2nd round safety. I am chugging Kelvin Joseph haterade and you can't tell me that guy wasn't a panic pick... so we basically blew our 2nd rounder to get two DE/DT tweeners in the 3rd. Not ideal.