Where is Porky when you need him? I deal mostly with wells in the Ogallala aquifer, where there is always a cone of depression, and one well always affects other wells. However, I have a little experience with rock bore wells. The ones I am familiar with usually have more than one crack in the rock. It is more like a spider web of cracks extending out from the well. These wells are usually low producers and the cracks are where the water is stored. When you pull the water level down there is definitely a depression. It may not take the exact shape of a cone but, it is wider at the top and more narrow at the bottom. The depression takes the shape of the voids or cracks in the rock. The depression could be all around the well or off in one or more directions. The water level in other wells that are drawing from the same zone is certainly affected. The closer these other wells, the lower the water level, as one well is pumped down. This shows me that there is a cone, it just follows the path of the voids.
I guess if you had a well with only one crack, the depression would follow that crack as the water level drops. So you would have a crack of depression but, still a depression.
I have been doing this for 40 years and I still learn something everyday. This is not a profession where you can learn what you need to know out of books alone. Most of what a driller and pump installer knows is learned the hard way. All the books in the world can't compare to the knowledge that is learned over many years in the trenches. I would much more believe what I was told by someone with the kind of experience that Porky has, over engineers and geologist with a mountain of book learning.
That is why this forum is such a good thing. We can learn a lot from the experience of others. A few questions back and forth and we can see what professionals from other parts of the world would do. There is always more than one way to skin a cat. I can always read a book on how to do it but, I had much rather hear from someone who had actually skinned a few.