Cox isn't exactly stellar in game tape either if you watch him. He is pretty raw as well.... So I don't know what you are talking about. Cox does not get double teamed all that often, and he is not exactly a beast against the run. He just uses his athletic ability... Gilmore does very similar things in the corner position. His technique is not spot on, but his potential is there, just like Cox.
I really don't think you've watched any film on Fletcher Cox. He has already proven himself to be the best defensive tackle in this draft, and the evidence is in the film. I believe Lout even did a really good evaluation on his tape vs. Brockers. He is not raw, by any means. He dominates his position and plays by instinct, great technique, speed, and power.
Gilmore on the other hand is a VERY raw prospect. The kind of player that has as many good plays as he does bad, being exposed by small school prospects that don't even compare to the receivers in the NFL.
Please tell me this, whats your favorite College football program? Just for fun.