I will admit to not reading your essay but for a very simple reason...Your claim is quite frankly preposterous...Our deceased relatives are pulling a move from the movie "Ghost" and creating these equisite art pieces?...I thought I'd heard it all...I'd personally believe Ickes Reptilian theory over the one you are attempting to propose any day. In my opinion there is only 3 possible explanations for crop circles..
A: They are alien origin and a way of communicating with the brighter minds of the human society (why waste time on dumb people right)
B: They are of human origin and a simple little prank
C: They are of human origin and are created by the government (perhaps through satellites and laser technology) to either put fear into your heart or debunk the real deal.
I'd imagine it's a mixture of all 3 with the majority coming from group C.
life as we know it is impossible on venus, but life as we don't know it could be anywhere.