he isnt dead
in teh movie, jack sparrow is bootstrap bill, its hard to cathc, but, whne they say they need the blood of the traitor to lift the curse, it takes like a few miliseconds, but it shows jack sparrow cut his hand w/ the medallion, and he throws it to will. plus there are many other clues, like thats how he survived. and didnt jack sparrow say he was off the crew b4 they stole the gold? then how does he become a skeleton in teh moonlight? just my thoughts