I went back and reread zoser's original submission and noted this:
"These analyses suggest that the disc was a three dimensional object located at a distance of at least 30 feet from the camera; the object's surface albedo was diffuse and of lower luminance than a sunlit cloud."
If the object were only 30 feet from the camera, the perceived size of it in the original picture wouldn't be far off from that of a frizbee. Of course that's just my perception, I'm not applying any science here. In any case it's small.
So if it is ET, then it would have to be some type of drone, unless the "occupants" are the size of...well, damn small anyway.
If the photographer didn't see that object when it was there, then it becomes apparent that they may not be able to say there was no one throwing frizbees at the time.
I don't see that much can be done with this case other than take it at face value.
Nothing points to a deliberate hoax and it's unidentifiable.
So, to me, it's a UFO.
Could be lots of things.