I'd like to know why he's so certain Davy Jones would accept Kate. It seemed to me that Davy Jones wanted Jack's soul, that the hundred souls thing wasn't serious because there was absolutely no way he could find a hundred people in that time period. And honestly, what would he do with Kate? What can she do that would make him as valuable as Jack?
(I know, she's a sue, which makes her more valuble than anyone and anything, but I mean in canon, what would he want with her?)