I understand Jack's niche; my thought is simply that King of the Seas is rather a logical evolution of Jack Sparrow - he wouldn't be "Davy Jones" per se, he'd be "Jack Sparrow" - excuse me, Captain Jack. *G*

I wouldn't necessarily mind Will as Davy if he was a different kind of Davy - not a vengeful, wretched, bitter entity, but empathetic to those who suffer, and acting accordingly. I like Will a lot and I just want to see his character well-served.