The 7 site, although turning up some odd artifacts that had numerous candidates for their existence at the site, doesn't seem to be the logical location for a newly arrived out of gas plane crew. I can see it has its benefits, nice and cool, access to lagoon and sea, turtles, fish, birds, shade and so on. But if you are waiting to be rescued you would want to be in the vicinity of things that are easily spotted from the air, the NC wreck and your plane (while it was still a plane as opposed to a submarine).
The 7 site seems to be the place to be when all hope of rescue has gone and of course, a nice place to relax for the islanders, loran station crew and, whoever else fancied a nice relaxing BBQ. As Malcolm mentioned there are probably layers of occupation there.
Camp zero, if it existed, which would be likely under the circumstances, is the place to find artifacts that could only have come from AE, FN and Electra.
All IMHO of course