As far as the hole Dunfield dig being a conical shape, atleast some what yes. Every pic we've ever seen would say so. Unless you think he used that grabbing bucket and only dug as wide as it was straight down. How do you think he dug it, based on the pics that are out there.. Here is another pic. Not very good quality but you can see it is much wider at the top then the bottom, or how far you can see down atleast. What do you call that shape?Okay you never mentioned side tunnels.
I can see you feel strongly about the the validity of the conical shape of the dig.
Based on your pic, I don't agree unless there is something else. Agree to disagree?
I'll come back to the jewels business in a bit. There is a fine line between deductive reasoning and rationalization (I WANT there to be some kind of treasure).
Now I have to figure out how to get out of writing an essay for someone with a lot of questions. It REALLY IS annoying when other people figure out a job they want you to do for them.