This doesn't mean anything. I am not asking Rocks to fight Imu or kill him, but to simply show that he had Davy Jones in him. If you are assuming that Davy Jones is being sealed into people, it would be a good idea for that to have been shown, instead of a vague line about following Davy Jones. Plus, how can Davy Jones be sealed into someone when we know he sunk to the bottom of the ocean?