Well Kerney is nothing like Freeney. Freeney is the best pass rusher in the NFL. He has amazing speed off the edge and his spin move is just dazzling, on par with the great pass rush moves of all-time like Deacon Jones' "head-slap."
Kerney has decent edge speed, but gets most of his sacks due to his motor as many announcers are quick to point out. He has good hand use and works his way to the QB. But any OT with decent feet, good balance, and good technique and hand use (like a Walter Jones) is going to dominate Kerney. He is strong, but he can't bull-rush and he's not exceptionally quick, so he's not going to blow by quality LTs. I think it's the main reason why Kerney plays LDE in our scheme, because if he was on the right side the majority of the time, his sack numbers would be halved.
I don't want to bash Kerney, who is one of the top DEs in the league (definitely Top 15), but when you're talking about guys like Freeney, Peppers, and Strahan, you're talking about guys that are just in a whole nother category.
"Vincere scis, Hannibal, victoria uti nescis" -- Maharbal, 216 B.C.E.