[tina_als_girl]

Well, firstly, there is no Captain Grant Sparrow. There is only Captain Teague, Pirate Lord of Madagascar (yes, Teague is his last name; no Sparrow--this information comes straight from the writers).

And based on all the photos of Keith Richards and his photo double, as well as the 60% of the script that's available.... Teague never goes anywhere near the Locker. The majority of his screentime will be nearer the end of the movie.

Based upon the script, I'd say that Wikipedia's actually fairly accurate this time, and the image of Jack as a member of the Flying Dutchman crew is simply a hallucination on Jack's part.