Don't you think that the same offense did nothing in the 2nd half of the games against the Chiefs and Patriots after taking a lead in the 1st half ? The Offense was guilty as much as the defense.
Also, both the offense and defense could not make vital plays at the end of the game to make a difference. For example, the Defense allows the Jaguars to score a TD in the last 3 minutes after the Bills ahd take the lead via an INT return for TD. Similarly, the Offense could not muster anything against the Chiefs or the Eagles at the end of the game