It really is an impressive haul for one draft. I still can barely believe it happened the way it did.
I'm not quite sure everyone realizes just how physically talented Gregory is. There has been so much BS talk about his off the field issues that it kind of becomes overlooked just how special his tools are. Physically, if you put about 10 pounds or so on the guy, I'm not sure anyone could draw up a better edge rush prospect. His extremely long arms, superb athleticism, his knack for rushing the passer, and his football IQ are about as good as you can get. If Garrett and Marinelli can get his mind right, he is a top 5 pass rusher in the NFL.
The knack for pass rushing and his intelligence are what tip things in his favor, IMO. There are a lot of athletic pass rushers in the league, but it is only the one's who naturally have the lean, burst and understanding of how to beat OL that rise to the top. Either guys have it or they don't. Not many do. Gregory has it in spades though. Smarts is a huge thing too. DL stunts, zone blitzing, etc. are much easier for guys who think on their feet and can learn fast.
It is no wonder that Dallas had him ranked 4th overall.