Geoffrey,
That's a really interesting aerial. Along with the conjoined 14/15 fairway you mentioned, and the cart path coming from the left of 3 & 4, there are a few other things I though worthy of note;
Most importantly, the corridor for the original 6th (playing to today's 16th green) is still almost all there, with just some overgrowth starting. This should confirm any remaining doubts as to the authenticity of this wild hole.
It's difficult to tell where the green is on #4...whether on the island, or in today's position. Perhaps Mark could check with a couple of the "old-timers" crew to see their recollection of the positioning of this green, as well as tee's for both 4 and 5 to the left of the creek??
I'm also curious as to the location of the 12th tee as I'm still not 100% certain I know where it was exactly.
Some minor bunkering differences/omissions are also noteworthy, such as the fronting bunker on today's 10 being split into 2 bunkers.
p.s. I suspect that the other two aerials (once available online), particularly the oldest one, should prove enlightening in a number of areas.