I've been thinking if anyone replaces Davy it'll be Jack. It wouldn't be Will because Disney likes their main-character love stories happy (I could be wrong, the movie was shocking dark for PG-13 Disney) and it can't be Barbossa because he'd be scarier and more ruthless than Davy. I think the whole reason Jack couldn't get the compass to work was because he knew whoever killed the heart would take Davy Jones' place and, while he wanted to get out of his debt, he wasn't completely sure he was willing to go *that* far. I think that's why people saying Jack's wishy-washy or not sure what he wants in general has been bugging me, somewhat.