General George S. Patton once said, "Nobody ever defended anything successfully; there is only attack and attack and attack some more."
Football is a game of attacks.
If you want to win, then you need to be better at attacking their offense than they are at attacking your defense. In Kansas City Chiefs defensive coordinator Steve Spagnuolo's system, this starts with the front four of the defensive line.
You can never have too many pass rushers. Last week Chiefs general manager Brett Veach said that he expects newly-acquired defensive end Charles Omenihu to kick inside to defensive tackle on third downs and rush next to Chris Jones— this leaves an open spot for a third-down pass rush specialist who can also possibly rotate in on early downs as well.