>The Alamay.com web page says it's a 53 MB photo but the .jpg is only about 2.3 MB
That sounds about right if the 53MB file was converted to a TIF. Not sure what the new DSLRs Large JPG file size is, thinking between 25-30 mb?
The 2.3mb jpg is useless. That's the edited file that's converted to SRGB for web use.
A Getty guy said photog shot original in large JPG, not RAW (.cr2). I think that original large JPG would be uploaded to a cloud server any any editors would download a copy of the large JPG to work on. I don't think that they would alter the original JPG.