To me "circumstantial" does mean "unproven" in the stricktest sense. But other explanations like flotsam and/or jetsam from the aircraft may be involved. Or Gallagher, as mentioned. Or even Coast Guard (or their "invitees"). Others may propose additional possibilities.
Ric Gillespie himself said the Artifact evidence and archaeolgy evidence was so great it was like the TV commercials for phone service, where Tighar is saying "can you hear me now, can you hear me now?" and this evidence has become too hard to ignore, hence, can you hear Tighar now? The evidence of a castaway(I thought) pointed to AE, since this was the only white European woman lost in the area. Likewise the seven site had documented substantial evidence of a 1930's woman castaway.
I guess we are on a new track now.
The eyes of Mr. Mellon ignore all of the hard work, and focus in on Freds pants at 800 ft and skeletons that look like rocks, fingers, and now housekeys.
So since 20 years of Archaeology is being ignored and labeled Flotsam, or Coast guard generated, let's all use our eyes are evidence.
I personally see in the lambrecht photo Amelia and Fred waving near a coconut tree with a sign saying they were rowing to Fiji in one of the lifeboats. The sign says "dont worry, we are in love, heading to Fiji, LTM", Yes, I can see that as well as any rock Mellon states shows a fuselage.
If we are going to speculate based on someone's poor eyesite, let's all pick a picture and interpret it at will, to hades with the archaelogical evidence I thought Tighar was based on.
They went to Fiji. 90% Fiji, 10% Mellons skeletons.