WOW. You guys seriously know nothing about the game.
Kahlil's job is not to make splash plays. His job because of his body type is to be the guy that takes on double teams so other guys can make splash plays. Those plays you're talking about that Shy Tuttle made that were so impressive happened because Kahlil was the guy the center was doubling and Shy was able to match up one on one against the guard and beat him with his quickness.
Shy played the 3-technique while Kahlil played the 1-technique.
The 1-technique in the 4-3 defense lines up in between the center and guard. His job is to take them both on. Taking on this double team allows other defensive lineman to match up one on one. That is what Kahlil did most of his career here at Tennessee. He was the 1-technique taking on double teams.
The 3-technique, on the other hand, lines up between the guard and tackle. Because the 1-technique is taking on two players, this allows the 3-technique to use his quickness to shoot the gap inbetween the guard and tackle to make plays in the backfield. Its usually the 3-technique defensive tackle that gets lots of sacks and tackles for loss.
Here is a link explaining this more:
Defensive Line Techniques - The Prototypes | NFL Analysis | Pro Football Focus
Everyone in this thread criticizing Kahlil should read it.