I wish they showed how exactly Davy Jones killed the Kraken, since Beckett said that he ordered him to kill it earlier in the film. As of today, I imagined that Davy Jones called it the same way he did in the 2nd film, but instead of sending it to sink a ship, he probably sent it to kill itself by stepping on land.
I never watched a full Pirates movie, so i dont know the whole story. All i know is that Davy Jones was ordered to kill the Kraken. When the camera shows its eye, it looks betrayed and heartbroken. It must have been hard on Jones