"But I do have problems with the endless underwater coral plane parts theory. Oops, definitely doesn't qualify as a theory. More like a presupposition."
But much more difficult to prove, or disprove due to the location though. It was a very deceiving image for sure but we know what has been found on Gardner island/Nikumaroro, bones, shoe parts, wooden boxes, bits of Alclad, bits of glass etc... so far, but not a complete airplane which will have been logically a lot easier to notice than shards of glass for example. As Ric pointed out, in one image it vaguely resembles the outline of an airplane but, in the next image, nothing even close.
Not sure how many images of the same area there were of the forty odd taken but compared to the number of individual frames from underwater video footage I guess it's a tiny percentage.
As mentioned before on numerous occasions until something is actually brought to the surface it is all speculation. Time will tell.
I still like the orientation, location, shadow and size of Richies sonar anomaly, it has a lot going for it.
IMHO of course